1.Let me just go back to the point I was making.請允許我再回到我剛才所提的觀點。

2.The Americans won't let her leave the country.美國人不允許她出境。

3. Let us approach the subject from a different direction.咱們從一個不同的角度來探討這個題目吧。

4. Let me know if you have any problems.你若有困難就告訴我。