【词汇讲解】
1.congregate vt. 使集合，聚集
如：Congregate living facilities for senior citizens.
为老年人设立的公共生活设施
We are congregated for a meeting.
我们集合起来开会。
2.keep track of vt. 留意
如：Keep track of the time you actually travel.
把你旅行的实际时间记录下来。
Please ask if you cannot keep track of what I'm telling you.
如果你们听不懂我所讲的话，请提问。
3.Settle on 选定，决定
如：We must settle on a place to meet.
咱们得把见面的地点定下来。
4.perceive vt. 察觉，感觉，认知，理解
如：I perceived his comment as a challenge.
我认为他的批评是对我的激励。
The patient was perceived to have difficulty in standing and walking.
据观察所见，病人站立和行走都有困难。
I perceived a change in his behaviour/that his behaviour had changed.
我发觉他的行为有些变化。