他跌倒时,前颚撞在了道路的边石上.He hit his forehead against kerb when he fell.而且他的面孔光润, 颚骨下陷.And then his face was smooth , with a receding jaw.牙痛使我整个颚都痛起来了.A too thacke racked my jaw....
The field may be provided by permanent magnets or by electromagnets.外地可能提供的永磁材料,或由电磁铁.The rails of their Maglev train were made of about 100 magnets.他们所做的磁悬浮列车轨道采用了约100块磁铁.Magnets are used for the controller's attac...