一定要注意，条目类中的所有属性不一定在这个类中的每个 Content 对象上都存在，这是可以接受的。

It's important to note that not all of the properties in the item class will necessarily exist on every Content object in that class, and that is acceptable.

youdao

因此我们在这个时候一定要注意到人性化，在一些不忙碌的时候让工人好好的休息，这样在忙碌的时候才能够更好的工作了。

So we must pay attention to human nature at this time, in some not busy time let the workers have a good rest, so that in the busy time to be able to better work.

youdao

在考虑过去一千年中十大最伟大发明的时候，一定要注意“发明”和“发现”之间微妙的区别。很多人都不清楚这个。

In considering the ten most significant inventions of the past 1,000 years, a subtle distinction must be made: the difference between "invention" and "discovery" is not as clear as one might think.

youdao