通风

通风

"Ventilation" or "air circulation."

In this context, '通风' means 'ventilation,' referring to the process of allowing air to circulate by making openings or using ventilation systems to ensure fresh air.

这个房子需要通风，因为空气不流通。

This house needs ventilation because the air doesn't circulate.

Here, '通风' combined with '报信' suggests a figurative use meaning 'to pass on a message or information secretly'.

我们通风报信给他，让他了解情况。

We gave him information beforehand, making him aware of the situation.

Again, '通风' in this context directly refers to the process of ventilating, applied here to ensure safety by maintaining proper air quality.

他们正在讨论如何通风以确保仓库的安全。

They are discussing how to ventilate to ensure warehouse safety.