很多时候，我们需要给别人一个回答，但是我们自己也不太确定。所以就要用到一些表示模糊的话（Vague Expressions），让人家了解一个大概的情况。下面是一些比较常用的表达：

There are about 600 people working in this company.
有600个左右的人在这家公司工作。

There are approximately 600 people working in this company.
大约有600人在这家公司工作。

There are a large number of students interested in taking his course.
很多学生喜欢上他的课。

Management predicts up to 50% growth for the coming year.
管理层预计来年增长50%。

It's kind of a bottle opener which can also be used to peel vegetables.
这种开瓶器可以用来给蔬菜削皮。

It's the type of place you can go to relax for a week or so.
这是那种你可以去放松个一周左右的地方。

They're the sort of people that like going bowling on Saturday evenings.
他们是那种喜欢在周六晚上打保龄的人。

It's difficult to say, but I'd guess that it's used for cleaning house.
这很难说，不过我猜这是用来打扫房间的。

I'm not really sure, but I think they enjoy hiking in the mountains.
我不太确定，但是我认为他们喜欢在山里徒步旅行。