a音標(biāo)[ei]

a的法語解釋

漢語翻譯art. 一，一個，一只，一件
【計】 累加器, 加法器, 地址, 振幅, 模擬, 區(qū)域, 面積, 匯編, 組件, 異步
【醫(yī)】 熱力效能詞型變化：名詞復(fù)數(shù):a"s英語解釋：名詞 a:

1. a metric unit of length equal to one ten billionth of a meter (or 0.0001 micron); used to specify wavelengths of electromagnetic radiation

   同義詞：angstrom, angstrom unit

2. any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes

   同義詞：vitamin A, antiophthalmic factor, axerophthol

3. one of the four nucleotides used in building DNA; all four nucleotides have a common phosphate group and a sugar (ribose)

   同義詞：deoxyadenosine monophosphate

4. (biochemistry) purine base found in DNA and RNA; pairs with thymine in DNA and with uracil in RNA

   同義詞：adenine

5. the basic unit of electric current adopted under the Systeme International d"Unites

   同義詞：ampere, amp

6. the 1st letter of the Roman alphabet

   同義詞：letter a

7. the blood group whose red cells carry the A antigen

   同義詞：type A, group A

例句：

1. I have engaged a room at this hotel.

   我已經(jīng)在這個旅館里預(yù)訂了一個房間。

2. You should give it a try.

   你應(yīng)該試一試。

3. I don"t care what a car looks like as long as it gets me from A to B.

   我倒不在乎汽車的樣子，只要能把我從一處載到另一處就行了。

4. The function of an adjective is to describe or add to the meaning of a noun.

   形容詞的作用是描述或增加名詞的意思。

5. China is a developing country.

   中國是一個發(fā)展中國家。

6. You"re just a good for nothing bum!

   你一無是處！

7. Declension means varying the forms of nouns, pronouns and adjectives in a sentence.

   變格是指名詞、代詞和形容詞在句中的形式變化。

8. Would you do me a favor?

   你能幫我一個忙嗎？

詳細(xì)解釋：
a 或 A

n.（名詞）
【復(fù)數(shù)】a`s 或 A`s
The first letter of the modern English alphabet.
A字母：現(xiàn)代英語字母表中第一個字母
Any of the speech sounds represented by the lettera.
A的發(fā)音：a所表示的讀音
The first in a series.
序列中的第一
The best or highest in quality or rank:
甲等，甲級：在質(zhì)量、等級上最好或最高：
例句：
grade A milk.
優(yōu)質(zhì)牛奶

Something shaped like the letter A.
A字形：形狀象字母A的物體
Music
【音樂】
The sixth tone in the scale of C major or the first tone in the relative minor scale.
A音或A調(diào)：C大調(diào)音階中的第六個音或C小調(diào)音階中的第一個音
A key or scale in which A is the tonic.
A調(diào)音階：以A調(diào)為主音調(diào)的音鍵或音階
A written or printed note representing this tone.
A調(diào)的音符：代表A調(diào)的手寫體或印刷體的音符
A string, key, or pipe tuned to the pitch of this tone.
發(fā)A調(diào)的樂器：調(diào)至A調(diào)音高的弦樂器、琴鍵或管樂器
A One of four types of blood in the ABO system.
A A型血：ABO系統(tǒng)中四種血型的一種

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a
a 2

indef.art.（不定冠詞）
Used before nouns and noun phrases that denote a single but unspecified person or thing:
非特指的一個：用在名詞或名詞短語前，表示單數(shù)及不確定的人或物：
例句：
a region; a person.
一個地區(qū)，一個人

Used before terms, such asfewormany, that denote number, amount, quantity, or degree:
用在如few或many之前，表示總和、總數(shù)、數(shù)量或程度：
例句：
only a few of the voters; a bit more rest; a little excited.
只有少許投票者；稍微多休息會兒；有些激動



Used before a proper name to denote a type or a member of a class:
用在一專有名稱前來表示一類中的一種或一員：
例句：
the wisdom of a Socrates.
蘇格拉底式的智慧

Used before a mass noun to indicate a single type or example:
用于物質(zhì)名詞前表示單一種類或事例：
例句：
a dry wine.
無甜味葡萄酒

The same:
同樣，同類：
例句：
birds of a feather.
同一種類的鳥

Any:
任何一個：
例句：
not a drop to drink.
滴水未沾


來源：
Middle English
中古英語
variant of an [an] * see an
an的變體 [不定冠詞an] *參見 an

In modern written English, the forma is used before a word beginning with a consonant sound, however it may be spelled (a frog, a university, a euphemism ). The forman is used before a word beginning with a vowel sound ( an orange, an hour ). At one time,an was an acceptable alternative before words beginning with a consonant sound but spelled with a vowel ( an one, an united appeal ), but this usage is now entirely obsolete. ·An was also once a common variant before words beginning with h in which the first syllable was unstressed; thus 8th-century authors wrote eithera historicaloran historicalbuta history,notan history. This usage had a phonetic justification inasmuch as the initialh in words such as historicalandheroic was often dropped, a practice that was largely abandoned by the late 9th century in educated speech.By 92" H.W. Fowler could regard the continued use ofan before such words as pedantic. Nowadays it survives primarily before the wordhistorical; one rarely encounters a reference toan hysterectomyoran hereditary trait. The use of a phrase likean historic opportunity is a harmless adornment in formal writing.
在現(xiàn)代書面英語中a 的形式用于以輔音開頭的單詞前， 但這個詞可能被拼成（a frog，a university，a euphemism）。an的形式用于以元音開頭的詞前（an orange，an hour ）。 有一度an用于以輔音開頭但拼寫形式為元音的單詞前的形式也被認(rèn)可（an one，an united appeal ）， 但這種用法現(xiàn)在已被廢棄了。An曾是用于第一個音節(jié)不重讀，且以h 為開頭的單詞前的一種常見變體形式； 所以8世紀(jì)的作家既可用a historical也可用an historical，但不可用a history也不可用an history。當(dāng)h在這樣一些單詞，如historical和heroic 中作為起首字母而又不發(fā)音時，這種用法在語音學(xué)上是合理的。 這種用法在9世紀(jì)末的高雅用語中已基本廢棄了。92"年時H.W.福勒還認(rèn)為an 繼續(xù)在這些單詞前使用太具學(xué)究氣了。 現(xiàn)在這種用法主要在historical 前時還保存使用； 在an hysterectomy或an hereditary trait 之前則極為少見。 在正式的書面語中，象an historic opportunity這種用法也不失為一種裝飾

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a
a 3

prep.（介詞）
In every; to each; per:
單一；每一；每：
例句：
once a month; one dollar a pound.
每月一次；一磅一美元


來源：
Middle English
中古英語
from Old English an [in] * see on
源自 古英語 an [在…里] *參見 on

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a
a 4

v.aux.Informal（助動詞）【非正式用語】
Have:
相當(dāng)于助動詞have：
例句：
He`d a come if he could.
如果他能來的話，他早就來了


來源：
Middle English
中古英語
alteration of haven [to have] * see have
haven的變化 [有] *參見 have

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a
a 5
abbr.（略語）
Also a. Absent.
也作 a. Absent.
PhysicsAcceleration.
【物理學(xué)】Acceleration.
Also a. Are[measurement]
也作 a. Are[測量]