n.后膛；臀部
v.给(枪、炮)装上后膛；给...穿上裤子
When the breech was closed and all was ready, the gunner yanked the lanyard. 大炮后膛门关上后，一切准备就绪，炮手拉动引火绳。
CDH was found to be more prevalent in female baby and baby with breech presentation. 在我们的研究中，我们亦发现女婴，及怀孕时臀位者，较易致先天性髋关节脱臼。
n.马的屁股带；炮索
n.后膛枪；后膛炮
