旅行者被建议在通过该地区时格外谨慎。

Travelers have been advised to exercise great ___caution when passing through the region.

我会极度谨慎地对待他说的任何话。

I would treat anything he says with extreme ___caution.

在飞机推回和发动机启动期间必须采取极端谨慎措施。

Extreme ___caution has to be taken during push-back and engine start.