But you actually need to keep a few caveats in mind as you do this, which is the fact that trends predict a lot of chemical properties, but they can't predict everything in terms of biological properties.

不过在你使用的过程中,需要牢记一些注意事项,那就是元素周期律可以预言很多化学性质，但是不能预言一切性质,比如生物学性质。

麻省理工公开课 - 化学原理课程节选

So a few announcements and those are: one, sectioning.

几个注意事项是：一，零件。

哈佛公开课 - 计算机科学课程节选

Then, coming to the rest of the details of the course.

然后,我来说说关于课程的其它注意事项

耶鲁公开课 - 基础物理课程节选

A few announcements at the beginning today.

今天首先说几点注意事项。

麻省理工公开课 - 固态化学导论课程节选