clear up: 澄清，解释；使明白；消除（误会、疑虑等）
The police hope to clear the matter up quickly．
警察希望迅速查清这件事情
The scientists have been trying to clear up the mystery．
科学家们一直试图揭开这个谜。

good point: 令人信服的观点
This is a very good point.
这是一个非常好的点。

put a stop to: 制止、使停止
It is time to put a stop to the violence.
现在是结束这场暴力活动的时候了。

prefer to: 宁愿
We prefer to stay where we are.
我们宁愿保持着现在的样子。

get involved: 参与
This often gets worse when specialists get involved.
尤其是当专业公司介入时，这便更糟了。
And when local people get involved in these projects they also cost less to produce.
而由于当地民众都参与这些项目，这些项目的成本也降低了。