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。

The transfer process proved challenging, as I had to complete all of the requirements for my molecular biology major in half the usual time.

youdao

现实中，绝大多数高血压患者都需要服用三到五种药物，而且很多药物需要每天多次服用来保证疗效持续，但即使如此，一天之内也只有大约一半时间能达到较好的疗效。

In fact, most patients with high blood pressure have to take three to five medicines, many of them multiple times a day, to be effective, and it's still only effective about half the time.

youdao

If one chord holds twice as long or only half as long, then we have an irregular harmonic change--irregular rate of harmonic change.

如果某一个和弦持续的时间是其他和弦的两倍或者只有一半，这就是不规则的和声改变。

耶鲁公开课 - 聆听音乐课程节选