In 1999, I set out to study the effects of efforts to bring the suburban middle class back to New York City.

我于1991年开始研究努力成就对纽约市城郊中产阶级的影响。

youdao

Qulity education should be carried out in Biology class, teachers must renew the concept of education and study teaching art and skills.

中师生物学课堂教学要实施素质教育，教师必须更新教育观念，研究教学艺术和技巧。

youdao

Our study can be divided into two parts: one is in class and the other is out of class.

我们的学习可以分为两个部分：一是在课堂上学习和一个是课外学习。

youdao

Of course, when class is out of session, students are expected to keep in contact, work on group projects and study together.

WSJ: Traveling the Globe -- Just to Get to Class