The bee’s knees字面解释是“蜜蜂的膝盖”，这是什么意思呢？请看对话：

    A: It’s such a lovely day. Thank you for inviting me to this outdoor picnic.

    B: You are welcome. I want you to try some of my new recipes.

    A: Super! I like your beetroot loaf and olive chocolate salad.

    B: OK. But now it’s time for my best creation: my special ice cream. This is the bee’s knees!

    Note: The idiom refers to something or someone that is exceptionally good. Bees carry pollen back to the hive in sacs on their legs. Perhaps this phrase alludes to the concentrated goodness to be found around a bee’s knee. Some people also say it refers to Bee Jackson. Ms. Jackson was a dancer in 1920s New York and popularized the Charleston, being credited by some as introducing the dance to Broadway. She was the world champion Charleston dancer and was quite celebrated at the time.