防毒皮
应该是省了that,that代指 children,而且than前面也省了in families in these years。这句话可以这样说,consequently, children are likely to have less supervision at home in families in these years than children was common in the traditional family structure.从以上例子,可以看出只要是“than”后面的同位语从句中出现之前主句中的相同词汇时,就可以省略,这里就是“ in familes in these years” 和 “children”。希望以上解释对你有所帮助