Through a survey of recent births we counted all midwives practising in the two study districts.

通过调查最近的婴儿出生情况，计算了这两个研究地区从业助产士总数。

youdao

As you work out your individual schedule, attempt to include a minimum of two study hours each day.

做个人日程表时，尽量每天安排至少两个小时学习。

youdao

Study it and then review it on a different day, and allow as much time to pass between the two study sessions as possible.

学习这篇章节，然后在另一天复习这个内容，让两次学习期间的时间尽可能拉得长一些。

youdao

In nineteen eighty-three, he began to study more than twenty-two thousand healthy male doctors over forty years of age.

VOA: special.2009.10.20

Right. Another way of saying it is there isn't random assignment of the subjects to the two conditions in the study.

换种方式说,受试者并不是随机安排在,这个研究中的两种情况下。

耶鲁公开课 - 心理学导论课程节选

Now here's a study that was done ten years later in nineteen-ninety-two, in this case it was with obese subjects.

这个实验是十年后的1992年做的,研究主题是肥胖

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

Two study authors contacted by Forbes defended their work.

FORBES: Medical Journal Slams Medtronic Over Payments To Doctors

The two year study will also involve academics from Dundee and Glasgow Caledonian universities.

BBC: Nurse at desk

Aug. 31, 2012: American announces that it has signed an agreement to exchange confidential financial information with US Airways so that the two can study a potential merger.

WSJ: A timeline of events in American Airlines' history