... do sth in advance提前做--- in half the usual time只用了平时一半时间 department store百货商场 ...
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The transfer process proved challenging, as I had to complete all of the requirements for my molecular biology major in half the usual time.
转学的过程是富挑战性的，因为我要完成所有分子生物学的必修课程，而却只有正常学习过程的一半时间。
There was so little traffic that Stone got home from work in half of the usual time.
交通顺畅，史东只用了平常一半的时间就到家了。
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