Kiddies, let's guess a riddle before our class, OK?
在上课之前，小朋友们，我们猜个谜语，好不好？
Before our class, I will make a short announcement. No food and no drinks in class.
在课前，我要先声明一点，课堂上不能有食物和饮料。
Before class ended, one student asked if the last question would count toward our grade.
下课前，一个学生问最后一个问题是否算在我们的分数里。
The day before yesterday,our class held a quiz.
前两天，我们班搞了一个有奖问答。
Before class, several of us dashed over to the store and sold our books.
考试前，我们几个赶忙跑到书店把书卖了，随后，我们坐在教室里等着考试。
One day when I was about 11, walking back to Public School 87 in Manhattan after our class visit to the Hayden Planetarium, I became overwhelmed by a feeling I'd never had before.
我11岁的时候，在参观完海顿星象馆后回到在曼哈顿但87公立学校时，我异常的兴奋，因为我从未有过这样的经历。
"This happens during our working hours, so when I exercise here, it's like I'm working at the same time," she said, tying her hair back before the class started.
“这个项目是在我们的工作时间进行，所以我在这儿锻炼的时候，就好像同时也在工作，”在课程开始前，她一边说一边把头发扎到脑后。
Last week our class organized an activity to thank our teachers before graduation.
上周我们班组织了一次活动去感谢我们的老师在毕业之前。
We got the news before the English class that some foreign teachers from a middle school in New York would visit our class. We felt excited and nervous.
上课前，我们得知来自纽约一所中学的一些外国老师将参观我们班，我们感到兴奋和紧张。
Need we hand in our exercise-books before class?
我们需要在上课前交练习本吗？
The best professor I ever had always reviewed me most important points from our last class before he moved on to new material.
我曾碰到过一位非常优秀的教授，在他给我们上新课之前，总会复习上一课的重点。
We should get our books ready before class.
我们应该在上课前把书准备好。
Then we wouldn't need to move our desks before we have a discussion in class.
那样课堂上在我们举行讨论前不必摆桌子。
Today is teachers' day. We say happy teachers' day to all of our teachers before class.
今天是教师节，上课之前我们祝所有的老师教师节快乐。
Today is Teachers'Day. We say happy Teachers' Day to all of our teachers before class.
今天是教师节，上课之前我们祝所有的老师教师节快乐。
Our expectation is that you will have done the readings, reflected on them and the questions we will pose about them for you to consider before class.
期望你在课前完成阅读，思考其内容和我们发布与阅读有关的问题。
Here's another example of this sort of "clever" short-sighted behavior: Recently one of our teachers was explaining something quite complex to us. It was the last class before the mid-term.
我再讲一个这种“精明”的短视行为的例子：不久前，一位老师在课上为我们讲解一个相当复杂的问题，而这节课是期中前的最后一节课。
Just before class ended, one student asked if the last question would count toward our quiz grade.
快要下课时，一个同学问起最后一个问题会不会影响测试成绩。
We sit for a few minutes in Sukhasana at the beginning of class to create a receptive mind before beginning our yoga practice.
在开始瑜伽练习之前，我们通过几分钟的简易坐，让自己进入一种接纳的状态。
In our school, teachers are preparing gifts for the students, introducing the history and traditional customs of Christmas before the first two minutes of each class daily.
如：购买礼物，装饰教室等。为了丰富同学们的圣诞节知识，英语老师们每天上课前两分钟都会给同学们介绍与圣诞节有关的知识。
The year before last, our class made a survey of the local dialect there.
前年，我们班在那儿搞过汉语方言调查。
After lunch we had half an hour before our next class. We were free to leave the school so me and some friends would drive our cars around town.
午饭后我们上下一节课，我们能自由地离开学校，因此我和一些朋友会开着我们的车围绕着城镇转。
The year before last, our class made a survey of the local dialect there.
允许用一年把时间搞调查研究，把问题理一理，把主意拿好，然后再下手。
Welcome to our class to learn Biology in a way we never done before!
欢迎加入我们的课程，以一种全新的方式来学习和探索生命科学。
Welcome to our class to learn Biology in a way we never done before!
欢迎加入我们的课程，以一种全新的方式来学习和探索生命科学。
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