He'd never been in a class before and he was not even sure that he should have been teaching.
他以前从未讲过课，他甚至不能确定自己是否应当从事教学。
I guess some of you may have been here before and may be surprised to see the name has changed.
我想你们之中一些人可能以前来过这里，大概会对我们改名了感到吃惊。
Then we enter those data, information about what the landscape looks like before and after the wetlands were drained.
然后我们输入这些数据，它们是关于湿地排水前后景观的信息。
However, on the second time round, she came upon a low curtain she had not noticed before and behind it was a little door.
然而，在第二次旋转时，她发现了一个自己没有注意到的低帘子，帘子前面和后面有一扇小门。
This comes from carefully conducted 'before and after' evaluations of interventions in schools, monitored by a research team.
这是一个研究小组对学校干预措施实行前后仔细评估得出的结论。
Through careful listening, you often see things you didn't see before and can even discover misunderstandings you didn't know.
通过仔细的倾听，你经常会看到你以前没有看到的东西，甚至会发现你不知道的误区。
I certainly recommend washing your hands after using the bathroom, before eating, after changing a diaper, before and after handling food.
我当然建议在使用厕所之后、吃饭之前、换尿布之后以及在处理食物的前后要洗手。
We had never experienced this kind of holiday before and had no idea what to expect.
我们以前从未经历过这种假期，不知道有什么可期待的。
He had never acted on stage before and he was very excited.
他从来没有在舞台上表演过，他非常激动。
Doctors tell us to wash our hands before and after every meal．
医生告诉我们，每顿饭的餐前餐后都要洗手。
Two friends of mine had gone to the movies the night before and neither had invited me.
我的两个朋友前一天晚上去看电影，他们都没有邀请我。
Just before and an hour after each workout, the scientists took additional samples of the men's blood and fat tissue.
科学家在每次锻炼的前后一小时，对这些男性的血液和脂肪组织进行了额外的采样。
Frost's Descent, the 18th solar term of the year, is the last solar term of autumn, during which time the weather becomes much colder than before and frost begins to appear.
霜降是一年中的第18个节气，是秋天的最后一个节气，在此期间，天气比之前变得更凉，开始出现霜降。
Juices are quick and easy to prepare, you can take the frozen fruit out the night before and have it ready the next morning.
果汁准备起来又快又容易，你可以在前一天晚上把冰冻的水果拿出来，第二天早上再制作。
A decade later another study reported that adult male white-tailed deer exhibited forehead rubbing just before and during the rut.
十年后的另一项研究报告称，成年雄性白尾鹿在即将发情和发情期间会摩擦前额。
Happened before and I survived.
这以前发生过，而我幸存了下来。
Ford had tried for "world" cars before and failed.
此前，福特公司曾尝试推出“世界”车，但最后以失败告终。
Audience members were polled before and after the debate.
听众成员在辩论前后进行了投票。
SUCH reports have been heard before and smack of wishful thinking.
此类报道已经出现过，曾经还引起了一些一厢情愿的想法。
Always take a backup before and after using the redistribute utility.
在使用重分发实用程序前后总是进行备份。
Redo logs - Files that contain the before and after images of changed data.
重做日志——包含更改数据的前后映像的文件。
Just before and during your period, levels of progesterone and estrogen decrease.
在经期前以及经期间，孕激素和雌性激素会减少。
The Banks are still operating as before and derivatives are still largely untamed.
这些银行仍像以前一样运营，其信贷衍生品也依旧难以操控。
Log Buffer - Memory allocated for storing before and after image of changed data.
日志缓冲区——为存储更改数据的前后映像而分配的内存。
The logging mediation handler could then be invoked before and after other mediations.
日志中介处理程序可被在其它中介之前或之后被调用。
Many women experience menstrual cramps just before and during their menstrual periods.
很多女性在经期前或经期期间会有痛经的经历。
The scientists analysed a variety of commercial beers both before and after storage.
科学家们分析了储存前后各种各样的商业啤酒。
Scrub your hands thoroughly with hot, soapy water before and after handling raw seafood.
在处理生海鲜前后记得用热肥皂水彻底搓洗你的双手。
Scrub your hands thoroughly with hot, soapy water before and after handling raw seafood.
在处理生海鲜前后记得用热肥皂水彻底搓洗你的双手。
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