例句：

　　The engine is very noisy at high speed.

　　這個(gè)發(fā)動機(jī)轉(zhuǎn)速高時(shí)噪音非常大。

　　Our next-door neighbours are very noisy.

　　我們隔壁的鄰居非常吵。

　　This area can be very noisy at night-time.

　　這個(gè)地方夜間有時(shí)會非常吵。

　　When I approached, they grew silent.

　　當(dāng)我走近時(shí)，他們變得沉默了。

　　She was silent, smiling mysteriously.

　　她沉默不語，神秘地笑著。

　　Her voice quavered and she fell silent.

　　她的聲音顫抖著，繼而沉默了下來。