n.坑(隕石坑、彈坑等)；凹地；火山口
They blasted a huge crater in the runway. 他們在飛機跑道上炸了一個大坑。
The depth of the crater is expected to be about 30 feet. 彈坑的深度預計約于30英尺。
Lava boiled up from the crater of the volcano. 熔巖從火山口沸騰著升起來。
n.火口壁
n.磨頂槽
