妹妹的用法和样例：
例句
-
我妹妹每周去一次美容院。
My sister goes to a beauty parlour once a week. -
＂在聪明的妹妹相形之下，她变得黯然失色。＂
She is quite eclipsed by her clever younger sister. -
我妹妹认为，她能极力说服父亲提高她每月的零用钱。
My younger sister thinks she can argue Father into increasing her monthly pocket money. -
小女孩个子太矮，只好仰着头看她的妹妹。
The girl was so short that she had to look up to her younger sister. -
他以戏弄他妹妹为乐。
He delights in teasing his younger sister.
