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。
They are worth having but not at the expense of better services.
它们值得拥有,但是不能因此放弃更好的'服务。
They will be slightly more expensive but they last a lot longer.
它们的价钱要贵一些,可是更加耐用。