钢背-锡青铜双金属衬套制造成本低、磨损率小、使用寿命长，可取代全青铜衬套。
Steel backed-tin bronze bi-metallic sleeve can be used to substitute all bronze sleeves due to its low manufacturing cost, better wearing quality and longer service life.
照明装置至少包括带内螺纹的金属衬套、印刷电路板、发光二极管、微动开关、弹簧电极、电池及金属后盖。
The lighting device comprises at least a metal sleeve with a female thread, a printed circuit board, a LED, a microswitch, a spring electrode, a battery and a rear metal cover.
衬套的作用是阻止金属的彼此碰撞。
The function of a bushing is to prevent metals from touching one another.
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