It's a waste of time (ie It's not worth) doing that.
做那种事是浪费时间。
We were two goals up (ie ahead of the other team) at half-time.
我们在上半场赢了(领先于对方)两个球。
Often called the early perinatal period, ie 2 weeks before delivery time.
通常也称围产前期，即分娩前2周的时间。
This book meets a long felt want, ie has been needed for a long time.
这本书满足了盼望已久的需要（长久以来就需要有这样的书）。
Please pay on (ie at the time of) delivery.
请于交货时付款。
Mr Curtis was the manager in 'my time, ie when I was working there.
我在那儿工作时，柯蒂斯先生是经理。
Mr Curtis was the manager in 'my time, ie when I was working there.
我在那儿工作时，柯蒂斯先生是经理。
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