他们在大学偶遇，最后结了婚。They had met by chance at university and finished up getting married.他们再次偶遇的可能性非常小。It was highly unlikely that their paths would cross again.几年来，尤尔和柯克偶遇了很多次。Over the years, Yul and Kirk had crossed paths ma...
溴、氯阳离子化合物的数量受局限.The number of cationic bromine and chlorine compounds is restricted.溴化反应较不易发生.Bromination takes place less readily.溴化烷可以这样形成.Alkyl bromides can be produced this way....