火山口

火山口

Literally means:

volcano crater

Actually means:

very dangerous place or situation

It refers to the outlet on the crust of the earth for the magma to erupt from the core of the earth.

Figuratively it refers to a very dangerous scenario or a critical moment when disasters are likely to take place at any minute. It is often used to mean that a situation is so urgent and grim that instant measures must be taken.

地球内部向地面喷发岩浆的出口。

比喻十分危险的境地，或祸患随时可能发生的关头。多用来指出形势严峻，情况危急，非立即采取措施不可。