It is time now for Barack Obama!" Kennedy was elected to the Senate in 1962, the year before the assassination of President Kennedy.

VOA: standard.2009.08.26

What was neat about it is before that time, the predominant species to use for air conditioning or refrigeration was ammonia.

在这之前是很整洁的，之前最主要的用于空调或者冰箱的,物质是氨。

麻省理工公开课 - 固态化学导论课程节选

If you never meditate before, this is a wonderful opportunity to do it for the first time.

如果你从没冥想过，这是你们尝试的好机会。

哈佛公开课 - 幸福课课程节选

"I think that there is a realism on our part that it will be some time before Afghanistan is able to sustain its security forces entirely on its own,".

VOA: standard.2009.12.09

It's often fanciful; it relates imaginatively events which it claims Happened in historical time, not in a primordial realm before time, And a myth is designed to explain some kind of practice or ritual or custom or natural phenomenon.

它常常天马行空，关乎一些想象中的事件,它们发生在有历史记载的时期，不是在史前原始王国，所以杜撰故事一般都是来解释一些惯例,或者仪式和风俗或者自然现象。

耶鲁公开课 - 旧约导论课程节选

The spokesman said it is possible for both sides to negotiate a new Strategic Arms Reduction Agreement in the little time remaining before the current one runs out in December.

VOA: standard.2009.04.02

In a Labor Day speech before union workers on Monday, Mr.Obama said it is time for lawmakers to end the debate over health care and pass legislation for him to sign.

VOA: standard.2009.09.08