1.Let me just go back to the point I was making.请允许我再回到我刚才所提的观点。

2.The Americans won't let her leave the country.美国人不允许她出境。

3. Let us approach the subject from a different direction.咱们从一个不同的角度来探讨这个题目吧。

4. Let me know if you have any problems.你若有困难就告诉我。