my elder is slimmer than l am .my younger sister is slimmer than she is.
问题描述：
my elder is slimmer than l am .my younger sister is slimmer than she is.
连成一句
答
用连接词while即可.口语中可以用括弧中的代替那个主系结构.
my elder is slimmer than l am(me),while my younger sister is slimmer than she is(her).