His dog is too wild, so it is hard to keep under control.他的狗太野了, 所以很难去控制它.We should try to keep under control and put it to the best use of mankind.我们应该使之置于我们控制之下,使其为人类发挥出最大作用....
to weld a broken axle焊接一条断裂的轴Where did you learn to weld?你在哪儿学会的焊接技术？They will also be used on factory floors to weld things together.它们也可用于工厂车间，用来焊接物体。...