crater

中文： 环形山、撞击坑、火山口、喷火口

1. A hemispherical pit created by the impact of a meteorite or other object.
2. The basin-like opening or mouth of a volcano, through which the chief eruption comes; similarly, the mouth of a geyser, about which a cone of silica is often built up.
3. The pit left by the explosion of a mine or bomb.
4. Any large, roughly circular depression or hole. (informal)

复数 craters