晚上，爸爸讓姐姐給我發(fā)的新書包書皮，可姐姐不愿意。爸爸就說：包書皮有獎(jiǎng)勵(lì)，包一本書3元錢。姐姐二話不說，馬上拿起書包起來。一會(huì)兒功夫，5本書全包完了，爸爸給了她15元錢。等我 學(xué)會(huì)了包書皮，也要給爸爸要獎(jiǎng)勵(lì)。

In the evening, my father asked my sister to send me a new bag cover, but my sister didn't want to. Dad said: there is a reward for the book cover, 3 yuan for a book. Sister said nothing, immediately picked up the bag. After a while, five books were all packed, and her father gave her 15 yuan. When I learned how to pack book covers, I also wanted to reward my father.