thigh

My thighs ached after cycling up the steep hill. ▶

骑车爬上陡坡后，我的大腿酸痛。

Regular cycling strengthens the thigh muscles and can improve overall fitness without excessive joint strain.

经常骑自行车能增强大腿肌肉、改善整体体能，又不会给关节带来过大负担。