约束可以使用“必须具有”这样明确的表述，也可以是比较隐含的，比如“它需要”(“需要”常常意味着“必须”)。

A constraint can explicitly use the word "MUST HAVE", or it might be more implicit like "it is necessary that," (and usually need to be "enforced").

youdao

霍金在加拿大的时候，比较明确的结果也许在于那里的科学家——特别是年轻的科学家——会因他的到来而受到鼓励。

What is perhaps a more certain result of Hawking's time in Canada is that scientists there - particularly young ones - will be inspired by his presence.

youdao

联邦电信委员会发布的三项新规中，有两项是比较明确的。

Two of the three new rules from the Federal Communications Commission (FCC) are relatively straightforward.

youdao

Or at least,it is clear what your alternatives are; it's not clear which alternative would be any better.

至少就算选择明确;,哪个选择比较好的标准却不明确。

耶鲁公开课 - 死亡课程节选

You have middle dialogues where you have to worry about whose views are whose.

对中期对话作品的鉴别,就比较困难,因为你无法明确观点与人物的对应关系

耶鲁公开课 - 死亡课程节选