known best的用法和样例：
例句
- I warned her to check the date her application form should he in, but she always know best. Well, she's cooked her goose now, because by this time next year she'll be too old to qualify for a grant.
我提醒过她检查一下交申请表的日期，可她总以为自己最懂。好了，现在她完了，因为明年这时候她的岁数超过了，没资格申请补助金了。 - Leave the cure to Mother Nature. She knows best.
要想痊愈就听其自然吧.
