a

The dog wagged its tail in expectation of a bone.
   那條狗搖著尾巴,巴望吃肉骨頭。

Income controls were used only as a short-term expedient.
   採用控制收入的辦法只是作為一時的權宜之計。

Don't expend all your energy on such a useless job.
   不要把你的精力全花在這無益的工作上。

Training a dog requires the expenditure of time and effort.
   訓練一條狗需化時間和精力。

I had a rather odd experience the other day.
   前些天我有過一次相當奇怪的經歷。

He experienced a pang of sadness.
   他感到一陣悲痛。

Have they ever experimented on a large number of patients?
   他們可曾在大批病人身上實驗過?

An expert system is a program which organizes and presents pre-existing knowledge.
   專家系統是一套能夠整理並呈現既有知識的電腦程式。

He made up a story to explain why he was absent.
   他編造了一個故事為他的缺席辯解。

Would you explain yourself a little more?
   你說得再清楚點好嗎?

The terrorists exploded a bomb in a store.
   恐怖分子在一家商店引爆了一枚炸彈。

There was a terrible explosion at the chemical plant.
   那家化工廠發生了一起可怕的爆炸事故。

Dynamite is a powerful explosive.
   炸藥是一種強有力的爆炸物。

Switzerland is a big exporter of watches.
   瑞士是手錶出口大國。

They consider it almost a crime to expose children to violence and sex on TV.
   他們認為讓兒童接觸暴力和色情電視節目幾乎是一種犯罪行為。

This is a clear exposition of the theory of evolution.
   這是對進化論的清晰的闡述。

"Shut up" is not a polite expression.
   "住口"不是有禮貌的話。

Can't you extend your visit for a few days?
   你們訪問的時間不能延長幾天嗎?

I would like to extend a warm welcome to our visitors.
   我想對我們的來訪者表示熱烈的歡迎。

To a certain extent, I am responsible for the delay.
   在一定程度上,我對拖延負有責任。