a fragrant herb and a stinking weed put together—the good is often coverd up by the evil
❍ ～，十年尚犹有臭。(《左传·僖四年》)There is a fragrant herb,and a noisome one; And ten years hence the noisomeness will continue.
一薰一莸yi xun yi you
when a fragrant herb is placed besides a blade of stinking grass,you smell nothing but the latter
一薰一莸yī xūn yī yóu
薰：香草；莸：臭草。指把香草和臭草放在一起，香气被臭气掩盖。比喻善恶不同类，善常被恶所掩盖。good and bad can’t be classed together, the good is often covered up by the evil