upper ball cover

基本解释

• [医药科学]上轴承盖

英汉例句

双语例句

• The lower cover attached by the rolling ball and sleeved by the middle cover is connected with the internal screw of the upper cover through the external screw.
  中套外周的上部制有外螺纹，中部制有上肩部，下部制有斜面；
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专业释义

医药科学

• 上轴承盖