我的生物老师怀特先生在上课前五分钟来到了教室。
My biology teacher, Mr. White, came to the classroom five minutes before the class began.
就在上课前，玛丽摔碎了她的眼镜。
值班生应该在上课前分发练习本。
The student on duty should hand out the exercise books before class.
我希望你们上课前，阅读这个时已经注意到了。
I hope some of you noticed this when you were reading over this before you came to class.
学生在上课前，必须阅读多份文献。
Students are required to complete lengthy readings prior to each class.
琳达发现的，并在上课前把它交来了。
以下列举的阅读作业必须在上课前完成。
The reading assignments listed below are what you should read before coming to class.
在每堂课上课前，需读完该课标注中的阅读资料。
上课前两小时不能进食，课后半小时方可少量进餐。
Don't eat anything two hours before the class and you may eat little half an hour after the class.
习题应在规定的日期当日上课前交，并且会给评分。
Problem sets should be handed in at the start of class on the specified due date and will be graded.
玛丽清楚的知道她应该在每次上课前阅读布置的作业。
Mary knows very well she should read an assignment before every lecture.
一天早上上课前我的物理老师走到我的寄物柜前，让我去他教室。
One morning my physics teacher walked up to me at my locker before school and asked me to step inside his classroom.
妈妈通常在晚上备课，但我知道有些老师上课前才备课。
My mother often prepares for her lessons at night, but I know some teachers prepare their lessons just before their classes.
下午上课前我经常和同学们玩游戏。我们下午上两节课。
In the afternoon I often play games with my classmates before class begins. We have two classes in the afternoon.
上课前后，请看管好自己的孩子。放学时，按时接走孩子。
Please do not leave your under age children unattended, and pick up your school children on time after classes.
一份15-20页的期末报告必须在第11次上课前缴交。
There will be one final paper (15-20 pp. ) which will be due on session 11.
有时会有同学在早上上课前来找我帮忙解答数学或科学作业的问题。
Other students would sometimes come to me in the morning before school to ask for help with their math or science homework.
在天气持续不稳定时，请于上课前两小时查询恶劣天气报告。
If unstable weather conditions persist, please check the Rainstorm Alert 2 hours prior the commencement of that class.
学生如因病或事请假，迟到或早退，请在上课前或后通知该班老师。
Students requiring a leave of absence, late or early dismissal are urged to inform their teachers before or after classes.
课程内容经常互相引用，在开始上课前务必确认看过所有课程内容。
Please make sure to look at all the sections before starting, as material is cross-referenced very often.
这些摘要包括接下来课程中的材料。学生在上课前要阅读这些摘要。
These summaries cover the material in the up-coming class session. Students are urged to read the summary before coming to class.
在你完成最佳初稿后，请至少在上课前一天，复印一份给同组的组员。
After you have written your best draft, distribute a copy to each member of your editing group at least one day before class.
特别重要的是，上课前学生要确实阅读应用阅读材料和准备讨论问题。
It is particularly important that you do the application readings and prepare any discussion questions BEFORE CLASS.
每周会指定平均三或四篇文章，或是三到四个章节，必须在上课前先行阅读。
An average of three or four article - or chapter-length readings will be assigned each week, to be read before the session for which they are assigned.
每周会指定平均三或四篇文章，或是三到四个章节，必须在上课前先行阅读。
An average of three or four article - or chapter-length readings will be assigned each week, to be read before the session for which they are assigned.
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