balance arm [机] 平衡臂
- She balances herself on the balance beam with a single arm.
她在平衡木上仅用一只手保持身体的平衡。 - With a roll ball rocking arm and balance tray. It is a smart design and convenient to be installed quickly.
■备有流滚珠式驻持摇臂及平衡托架,设计巧妙,安装简便,快捷。 - He was severely crippled and very short, and when we would walk together, his hand on my arm for balance, people would stare.
他走起路来一瘸一拐的,个子又小又矮。当我们走在一起的时候,他要用手扶住我的胳膊才能保持平衡,人们常常会直盯盯地看着。
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