rib

He fell off his bike and cracked a rib on the right side of his chest.

(Chinese) 他从自行车上摔了下来，撞裂了右胸的一根肋骨。

Humans typically have twelve pairs of ribs that form the rib cage.

(Chinese) 人类通常有十二对肋骨，构成了肋笼（胸廓）。