Areas near the frontier were rough and lawless in the old days.过去边远地区混乱不堪, 而且没有法律。The government recognised there were problems in urban areas but these could never be an excuse for lawless behaviour.政府承认市区存在问题，但决不可拿这些作为...
The workpiece is already on the lathe.工件已经上了车床.We used grinding machines only to smooth and finish a workpiece.我们只是用磨床将工件抛光和精加工.The carriage feeds the tool while the workpiece rotates.当工件旋转时,拖板送进刀具....
The tree is so badly damaged they are worried it might topple over.这棵树严重受损，他们担心它会倒掉。He slapped his knee and began to topple from his seat.他拍膝盖,开始在座位上昏昏沉沉地倒下去.How can we topple the chief from his position of trust?我们怎样才能把...