例句：
His contribution could be key.
他的貢獻(xiàn)可能是最重要的。
He could always smell out fear.
別人有什么恐懼，他總能覺(jué)察到。
This could set a new fashion.
這或許會(huì)開創(chuàng)一種新時(shí)尚呢。
Could I have your autograph?
我能請(qǐng)你簽個(gè)名嗎？
She could feel herself blushing.
她可以感到臉都紅了。