let in :v.
1.allow participation in or the right to be part of; permit to exercise the rights,functions,and responsibilities of
2.allow to enter; grant entry to
及物动词,让…进入
E.G.
Let's open a window and let in some fresh air.
我们打开窗子,让一些新鲜空气进来吧.
You should let me in.
你应该让我进来
希望对你有所帮助