You have no business to do that.你没权做那事.You have no business going into such places all by yourselves. If your parents take you, of course, that's another matter.你们不该自己去这些地方。不过如果是父母带你们去的，那就另当别论了。Daddy, you have no bu...
碱金属原子的价原子具有两种能态.The valence atom of an alkali - metal atom has two states.所有的碱金属都在闭合壳层之外有一单个S电子.All the alkali metals have a single s - electron outside a closed shell.当碱金属光谱显示出不容怀疑的双线结构时,是令人惊奇的.It was surprising when th...