n.坑(陨石坑、弹坑等)；凹地；火山口
They blasted a huge crater in the runway. 他们在飞机跑道上炸了一个大坑。
The depth of the crater is expected to be about 30 feet. 弹坑的深度预计约于30英尺。
Lava boiled up from the crater of the volcano. 熔岩从火山口沸腾着升起来。
n.火口壁
n.磨顶槽
