a small box with a button or dials (= moving parts) that allow you to enter a particular series of numbers in order to open the box and get the keys kept inside it

There's a spare set of keys in the keysafe on the outside of the house. 房子外面的钥匙锁盒里有一串备用钥匙。

Do you know the code to the keysafe? 你知道钥匙锁盒的密码吗？