Definition: the two areas of your body from under your arms to the tops of your legs Level: C2
站直，双臂放在身体两侧。
Stand with your arms by your ___sides.
她侧躺着。
She lay on her ___side.
跑步后，他感到身体一侧抽筋。
He felt a cramp in his ___side after running.
