1.oil barrel 油桶

例句:To keep warm they burnt wood in a rusty oil barrel.
他們在一只生銹的油桶里燒木柴來保暖。

2.mobile technology 移動技術

例句:Contemporary IT is increasingly a function of mobile technology, pervasive or ubiquitous computing, and of course, cloud computing.
當代的IT不斷向移動技術、普遍存在的計算和云計算發展。

3.in exchange for 交換

例句:The trade unions bargained away their rights in exchange for a small pay rise.
工會不惜犧牲自己的權利以換取微薄的加薪。

4.a trace of 一絲

例句:His face was unmoved, but on his lips there was a trace of displeasure.
他臉上沒有絲毫表情，但嘴角流露出一絲不悅。