Eye drops are necessary for a period of time after the procedure.

Subject curriculum has developed for a period of time.

学科课程已有较长的历史.

Buying over a period of time . 2 . Retaining profits within a company.

在一定时期的购买;2.公司内保留的利润.

Excessive fear over a period of time will also deplete Kidney essence.

长期的过分恐惧也会导致肾脏精华的损耗.

a piece of bread and butter

一块黄油面包

a piece of bent wire

一段弯曲的金属丝

Just slip in a piece of paper.

只要塞进一张纸就行。

It was just a piece of play-acting.

它只是一种作秀而已。

A piece of china crunched under my foot.

我踩碎了一块瓷片。

A powerful electric current is passed through a piece of graphite.

给一块石墨通入强电流。

They ceremoniously cut a piece of ribbon, declaring the exhibition open.

他们郑重其事地剪彩，宣布展览开幕。

He ticked off my name on a piece of paper.

他在一张纸上我的名字旁打了钩。

He hunted vainly through his pockets for a piece of paper.

他翻遍口袋想找一张纸，结果没找到。

Strain the juice through a piece of gauze or a sieve.

用一块纱布或过滤网将果汁过滤一下。

Mr. Long was now cutting himself a piece of the pink cake.

朗先生正在给自己切一块粉色蛋糕。

How very thoughtless. I'll give him a piece of my mind.

真是太没头脑了，我要告诉他我很生气。

Please cut me a piece of cake / cut a piece of cake for me.

请给我切块蛋糕.

Persuading him to give us the day off won't be a piece of cake.

要说通他放我们假可不是容易事.

It's going to be a piece of cake.

这种事不费吹灰之力.

He thinks it'll be a piece of cake.

他认为那是唾手可得的事.

The exam paper was a piece of cake.

那份试卷十分容易.