I’ll post the key through your letterbox when I leave.

【post】我走的时候会把钥匙塞进你的信箱里。

But that does not hinder the little brown mice; they run in and out without any keys through all the old houses in Gloucester!

但这并不妨碍小棕鼠；他们在格洛斯特的所有老房子里跑进跑出，没有任何钥匙！