signal的意思

n. 信號(hào)，暗號(hào)；預(yù)兆，征象；動(dòng)機(jī)；導(dǎo)火線

vt. 向…發(fā)信號(hào)；用動(dòng)作（手勢(shì)）示意；以信號(hào)告知；

vi. 發(fā)信號(hào)；

adj. 顯著的，優(yōu)越的；暗號(hào)的，作信號(hào)用的；

signal的用法

用作名詞(n.)

Signals are made with flags or lamps.

用旗或燈傳遞信號(hào)。

We live too far from the city to get a strong television signal.

我們住的地方離城里太遠(yuǎn),不能收到清晰的電視圖像。

用作不及物動(dòng)詞

S+～(+A)

She is signaling.

她正在發(fā)送信號(hào)。

The submarine signaled for help.

潛水艇發(fā)出求救的信號(hào)。

用作及物動(dòng)詞

S+～+n./pron.

She signaled the advance.

她發(fā)出信號(hào)前進(jìn)。

A bell signals the end of a school period.

鈴聲標(biāo)志著學(xué)校里一節(jié)課的結(jié)束。

S+～+that-clause

She signaled that he was about to turn left.

她打信號(hào)燈表示他就要轉(zhuǎn)到左面去了。

S+～+wh-clause

They signaled which way one is going to turn?他們打信號(hào)示意走哪一條路。

用作雙賓動(dòng)詞

S+～+pron./n.+ton./pron

He signaled a message to his brother.

他用信號(hào)向他哥哥發(fā)信息。

S+～+(to)n./pron.+to-v

He signaled the waiter to bring the menu.

他做手勢(shì)要侍者拿菜單來。

The conductor signaled the orchestra to rise.

指揮打手勢(shì)讓樂隊(duì)起立。

Jim signaled his helplessness to Mary to leave the party.

吉姆無法從宴會(huì)脫身時(shí),他向瑪麗使了個(gè)眼色,表示無可奈何。

S+～+(to)n./pron.+wh-to-v

Tom signaled his friend which way to go.

湯姆示意他的朋友走哪條路。