名词
中文翻译：球头
同义词：
['ball joint', 'ball jointretainer']
例句：
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1. Thedoctor advised him to use a ball jointretainer for six months.
医生建议他使用球头保持器六个月。
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2. The patientwas fitted with a ball joint retainerafter the surgery.
手术后，患者被安装了球头保持器。
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3. The ball joint retainer helped the patient regain his range ofmotion.
球头保持器帮助患者恢复了活动范围。