•Her suitcase was precariously balanced on the tiny luggage rack above her head.她的手提箱放在头顶的小行李架上，摇摇晃晃的，很不安全。

•He lived rather precariously from one day to the next, never knowing where his next meal was coming from.他日子过得很不稳定，过了今天不知道明天下一餐在哪里。