About what? A dangerous place? What idioms are there?

Dragon Pool and Tiger Cave, daoshanhuohai, abyss, artillery fire, den of wolves.

1. Longtan Tiger Cave: pool: deep puddle; Cave: the animal hides in a deep puddle, and the tiger hides in its nest. This is a very dangerous place.

2. Daoshanhuohai: a metaphor for an extremely dangerous and difficult place.

3. Abyss: Abyss: deep pool. Metaphor is a very unfavorable situation. Zhang Wan: Describe very long, very high or very deep. In fact, it is not necessarily 10,000 feet, but it is exaggerated and profound. It also refers to difficult situations and dangers, the abyss of pain/falling into the abyss of sin.

4. artillery fire: artillery fire filled the sky. Describe the fierce war scene.

5. The den of the tiger and the wolf: the den of the tiger and the wolf. Metaphor is an extremely dangerous place.