...provide their reader with unimportant facts 向读者提供无关紧要的事实 lead to the high wall 通往高墙 find out the exact number of steps and the height of the wall 弄清台阶的确切数字和围墙的高度 ..
Inthe cross piercingprocess, as thepiercingprecessionpowercan notovercometheresistance force, it will leadto rear-jamming whenrollingthick-walltubesorhighalloytubes.