The bee's knees:

蜜蜂的膝蓋 ×

了不起的人或事 √

例句：

She thinks Barry is the bee's knees.

她認(rèn)為Barry是個(gè)了不起的人物。

ps：

As busy as a bee:

像蜜蜂一樣忙碌 √

例句：

Mum is always as busy as a bee in the morning. 

媽媽每天早上都忙得不可開(kāi)交。

As graceful as a swan:

（像天鵝）姿態(tài)優(yōu)雅的

例句：

Mary is as graceful as a swan in everything she does. 

瑪麗不管干什么事情，動(dòng)作都非常優(yōu)美。

As gentle as a lamb:

像小羊一樣溫順

例句：

She is as gentle as a lamb.  

她就像小羊一樣溫順。