The mailman just dropped some mail in our box, Grandpa.
邮差刚刚塞进一些信件在我们的信箱, 爷爷。
The postman always comes at 2 o'clock.
邮递员总是在2点钟来。
As no pumas had been reported missing from any zoo in the country, this one must have been in the possession of a private collector and somehow managed to escape.