arm例句

When you are sitting, keep your elbow on the arm rest.
坐立时,把胳膊肘靠在扶手上。

Amy lifted her arm to wave. "Goodbye," she called.
埃米举起胳膊挥挥手。“再见,”她喊道。

A roll of fat jiggled on the underside of her arm.
她胳膊下侧有一层肥肉一颤一颤的。