knuckling

1.Charlotte rapped on the window with her knuckles.

夏洛特用指节轻敲着窗户。

2.Our fingers bend at the knuckle.

我们的手指在指节处弯曲。

3.He got a rap over the knuckles for spending too much money on his business lunches.

因为在餐上花钱太多，他挨了一顿批评。

4.The most common type of joint in the human body is the diarthrodial joint -- knuckles and shoulders are examples -- in which two bones come together in a capsule.

人体中最常见的节是运动节，如指节和肩节等，节处的一物把两根骨头结合在一起。