【句子】

When it is struck, a tuning fork produces an almost pure tone, retaining?its pitch over a long period of time.
音叉被敲擊時,產生幾乎純質的音調,其音量經久不衰。?

【解析】

1.strike

1)n. 罷工,打擊,毆打

It was not long before tragedy struck again.
沒多久,災難又再次降臨。

2)v. 打,撞,罷工,劃燃

The union struck for better work conditions.
工會為爭取更好的工作條件而罷工。

3)strike, beat, hit, tap, knock辨析

strike 常表示用力打或敲

hit 有“撞擊,襲擊”之意,比strike稍弱一些,指一次性的打擊或擊中

beat 指連續(xù)多次的打,也指有節(jié)奏的擊打,還可表示打敗

tap 指輕拍

knock 指敲打并伴有響聲,還可表示打倒、撞翻

2.tune

1)n. 曲調,調子,和諧,協調,數量

He played a tune on the violin.
他用小提琴演奏了一首曲子。

2)vt. 為 ... 調音,調整

The orchestra tuned their instruments.
樂隊在給樂器調音。

3.pure adj. 純的,純潔的,純粹的

①Water can be made pure by distilling it.
水可以通過蒸餾而提純。

②She is a pure girl.
她是一個純潔的女孩。

4.tone

1)n. 語氣,音調,調子,色調,風氣

That violin has a beautiful tone.
那支小提琴的音色很美。

2)v. 使更健壯,定調,調色,裝腔作勢地說

Exercise tones up the muscles.
運動使肌肉強化。

4.retain vt. 保持,保留,記住,聘請

Her memory retains everything she reads.
她過目不忘。

5.period n. 一段時間,周期,時期,課時,學時,句號,月經

①He was on his feet again after such a long period in hospital.
住院很長一段時間他復原了。

②Which period of history are you studying?
你正在學哪一段歷史? ??

【練習】

It _____ her how quiet and gentle he was.

A. beat ?B. hit ?C. struck D. knock

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