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1.lose track of 跟不上进展
His mind would wander, and he would lose track of what he was doing
他会走神，忘了自己正在干什么。
2.in the absence of 没有
In the absence of such evidence, there is no a priori hypothesis to work with.
没有此类证据，就没有可以推理的前提。
3.pay off 成功
Sandra was determined to become a doctor and her persistence paid off.
桑德拉决心成为医生，她的坚持取得了成功。
4.drop off 减少
Sales to the British forces are expected to drop off
预计对英国军队的销售量会减少。
5.sort of a 有几分
He was trying to decide whether the question was some sort of a trap.
他试图判断那个问题是不是个套。
