They finished the task within half a year.

他们在半年内完成了那项任务。

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They finished the house within half a year.

他们在半年内盖好了这幢房屋。

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It is a safe bet that no one can master two foreign languages within half a year.

我们可以很有把握地说，没有人能够半年内突破两门外语。

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Indeed, futures contracts on the Vix indicate that investors expect the gauge to climb above 20 points within half a year, and the volume of bets remains elevated.

CNN: Fear index plummets to a 5?-year low

It said 58% of short-sentenced prisoners committed a crime within a year and half a million offences were committed each year by released prisoners.

BBC: A prisoner in a cell

The average period chief marketing officers hold a job jumped from 34.7 months to 42 months last year, an increase of more than half a year within the space of a year.

FORBES: CMOs Are Staying on the Job Longer Than Ever