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...
他们的行动使两国关系面临严重恶化的危险。Their actions threatened a serious breach in relations between the two countries.当婚姻破裂时，孩子们也被卷进父母感情日益恶化的漩涡中。When marriages break down children are swept into the vortex of their parents' embitter...