clamp down on
英语情景对话：
A:It's said that the government will clamp down on the new policy.
据说政府呀取缔那项新政策了。
B:Are you sure of that?
你敢肯定吗？
A:I am not certain about that.
我也不确信这个消息。
B:They may have some difficulty in doing it.
政府那么做可能很困难。
英语学习笔记：
1.clamp down on：严格限制，取缔
Eg.The police has promised to clamp down on criminal activities.
警方已许诺要取缔犯罪活动。
Eg.The police will clamp down on speeding starting next month.
警察将自下个月起加紧检肃超速。
Eg.The police are going to clamp down on criminal activity in this area.
警察即将取缔这一地区的犯罪活动。
2.be certain about：对......有把握，对......确信无疑
Eg.I'm afraid I can't be certain about the success.
我恐怕对成功不太肯定。
Eg.One thing we can be certain about is that his writing was different to anything that had come before.
有一点我们很确定，那就是他的作品比之前人有很大差异。
We cannot be certain about what happened.
我们只能猜测发生了什么事。
3.be sure of：对......肯定
Eg.Can I be sure of a profit if I invest?
我要是投资，肯定能获利吗?
Eg.Book early if you want to be sure of a seat.
要想十拿九稳有个座位，那就早订座。
Eg.I left a message so as to be sure of contacting her.
我留下了张条子以便与她取得联系。
4.have some difficulty in doing something：做某事有一定的难度
Eg.I have some difficulty in go through the test.
要我通过这次测验有点困难。
