Window locks are fairly cheap and absolutely essential.

【essential】窗锁相当便宜，绝对有必要安装。

No prints, no murder weapons, all doors and windows locked from the inside.

没发现指纹和凶器 所有的门窗都从里面上锁。

First, when they leave their dormitories, they should keep doors and windows locked to keep out sneak10 thieves.

首先，他们离开宿舍时， 应锁好门窗， 以防小偷偷袭。