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1.secret services 特务机关
例句:Our secret services and our navy are completely incompetent.
我们的特工处以及我们的海军都无能之极。
2.at the time 当时，在那时
例句:I was not in Britain at the time.
当时我不在英国。
3.key witness 关键证人
例句:He is expected to be the key witness at the trial.
他将成为审判的关键证人。
4.tip off 透露消息；泄露
例句:The police arrested him after an anonymous tip off.
在接到匿名举报后，警方逮捕了他。
