当我们把船调头的时候，信号器又不停地发出哔哔声。When we turned the boat about, the signal began to bleep again constantly.交变系统,使一段给定路段上的信号器,展现相反的指示.The alternate system allows signal installations along a given length of road to show contrary i...
铝和玻璃一样可被熔解.Aluminum can be remelted as successfully and as often as glass.熔解后氧化物(锡渣)之发生量较一般焊锡减低近半.Oxide occurring after melting approximately 50 % less than common solder.现在一些碱含量仅为13%的玻璃也可以被成功的熔解和用于加工.Some containing onl...