The pre-class clamour of children does not stop with the bell because some teachers have not turned up yet.

上课铃响了，孩子们还和课前一样吵闹，因为有些老师还没有到教室。

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With the ability to upload thatsame lecture to the Internet for pre-class viewing, the question of how to use classroom time isforcing faculty members to engage in a deep examination of pedagogy.

如今，同样的讲座可以提前上传到互联网上供学生课前观看，而如何使用课堂时间的问题将迫使教师们深入研究教学法。

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To improve experiment results, teachers should carry out pre-class coaching before class, guide the students in the course of the experiment and analyze and sum up the experiment after class.

为了提高实验效果，教师应在课前进行预习辅导，在实验过程中进行操作指导，在实验后进行分析总结。

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It's a pre-req for the class, right?

这写可都是博弈论的先行课啊

耶鲁公开课 - 博弈论课程节选

It's a class about pre -1865 American literature,

它是关于1865年之前的美国文学，

写作课程比较难 - SpeakingMax英语口语达人

So, it seemed like a good start for me, pre-med/bio, and I signed up for my bio class -- I found out, as Professor Drennen did, that I had to take chemistry as well. I wasn't as upset, I was sort of a neutral chemistry person at this point, but I thought it was pretty smart to get it over with on the first semester, so that's what I did.

一个既在科学上有挑战又能帮助他人的职业，从医学预科或者生物起家-,我参加了生物课，我和Drennen教授一样，我也必须要上化学课，我并没有很不爽,我当时对化学的态度很中立。

麻省理工公开课 - 化学原理课程节选

My youngest son's pre-school class was recently asked what their dads do for work.

NPR: Do What You Love

In the pre-K class Karen Simak, a 44-year veteran of the Chicago school system, is focusing her efforts on a broader life lesson--planning ahead.

FORBES: Kindergarten Lawyers

Judge Batts makes these points in an 83-page pre-trial opinion for a class-action lawsuit filed by students, workers and residents of Lower Manhattan and Brooklyn who say they were exposed to hazardous materials and polluted air.

ECONOMIST: Many of the terrorists' victims have not stopped coughing