To be considered for the study, children were supposed to be close to cigarette smoke at least 5 times a day.

VOA: special.2009.01.13

You know of course that this is absolutely crucial to the study of the law to this day: what are the grounds for understanding the meaning of the Constitution, for example?

你们当然知道,今天这些问题对于法学研究很关键：,比如，理解宪法的,根据是什么？

耶鲁公开课 - 文学理论导论课程节选

How many hours do you study every day?

你每天要学习几个小时？

关于学校生活 - SpeakingMax英语口语达人

Average walking distance on the six-minute test improved from 1, 508 feet to 1, 588 feet over the 30-day study period.

WSJ: A Virtual Coach Spurs Patients

To qualify for the study, the children had to have a normal IQ and not need a medication change during the five-day study period.

ENGADGET: Researchers create video game that monitors heart rate to keep children's anger in check

At the end of the 40-day study, all the mice who were given the Trojan treatment were still alive and had no signs of tumours.

BBC: Health