1.be able to 能够
例句:We want a man who must be able to cost.
我们需要一个能计算成本的人 。
2.start to 开始
例句:There has been a busy start to polling in today's local elections.
今天地方选举的投票一开始就人头攒动 。
3.operating system 操作系统
例句:The virus has infected the operating system of his computer.
病毒已使他的计算机操作系统受到传染 。
4.come as 来作为
例句:It didn't come as a great surprise to me, I might say.
可以这么说,这并没有令我大吃一惊 。