研究了粪便与厨余垃圾的源头真空管道收集及现场生物处理技术，根据系统工艺设计方案进行了分单元的小试。

The biological treatment technique of collection at source and disposition on-site of night soil and kitchen garbage were presented.

youdao

这个单元现在为本课程既定的一部分。

This unit is now an established part of the course.

《牛津词典》

尽管这对于熟悉您的工作单元十分有用，但是这对于实际的应用程序并无太大作用，您和您的孩子就会很快的失去兴趣。

While this is useful for familiarizing yourself with the unit, it's not going to be useful for real applications, and you and your kids will lose interest quickly.

youdao

Okay. So here we have a series of groups of two quarter notes.

好的,我们有好多的单元,由两个四分音符组成

耶鲁公开课 - 聆听音乐课程节选