in their life还是in their lives?这两个短语哪个是正确的,

in their life还是in their lives?这两个短语哪个是正确的, in their lives还是in their life 关于life这个单词They have too many problems in their lives 正确吗 不是说 in their daily lives造句 all their life与all their lives 哪个对? take their life还是take their lives?翻译是神马?{为什么教科书的和百度的不同啊? 是in their opinion还是in their opnions in their opinion还是 in their opinions? 关于their life和their lives的疑问 Many people try to use less paper in their life,为什么不是lives? 是in our life 还是in our lives? People are divided in their opinions.这句话的语法以及divide in是个短语吗?