speed用作名詞的用法例句

　　The police are advising motorists to reduce speed because of the fog.由于有霧，警察告誡駕車(chē)者減慢速度。

　　This plane can reach speeds in excess of 1000 kilometers an hour.這架飛機可以達到每小時(shí)一千公里以上的速度。

　　She finished typewriting the letter at speed.她迅速打好那封信。