The latter two categories have analysts worried.

VOA: standard.2009.11.14

I'd like you to keep in mind that these two categories of purposes, both the explicate and the implicit, are something that we need to be responsible for whatever we do as designers of educational situations.

我希望你们记住,这两种教育目标，即表层目标和深层目标，是我们在对教育情境,进行设计时,必须考虑到的内容。

麻省理工公开课 - 媒体、教育、市场课程节选

Poetry is not interested in expert debate at all, and it converts the big spectrum of possible degrees of accent into those two simple categories: stressed and unstressed syllables.

诗是从不在乎这样专业的争议的，它将涵盖很多不同程度的重音的音谱,简单分成两种：,重音和非重音节。

耶鲁公开课 - 现代诗歌课程节选