求翻译：2. 所有镜头均经校验，不得自行拆开，镜面上如有污迹，可用脱脂棉稍沾乙醚、酒精混合液（混合比例7：3）轻轻揩拭，注意不要让酒精渗入物镜内部，以防镜片脱胶。镜面上的灰尘可用吹风球吹去或用干净毛笔轻轻拭去。清洁机械部分需涂无腐蚀性润滑剂、涂油时，特别注意不要碰到光学部件，尤其是物镜。是什么意思？

All lenses were confirmed by check, shall not dismantle, if any smudges on the mirror, the available cotton wool slightly moistened with ether, gently wiping alcohol mixture (mixing ratio 7:3), be careful not to allow the alcohol to penetrate the objective lens internal to anti-lens unglued. Dust on

正在翻译，请等待...

2. all the lenses have been checking shall not be opened on their own, if there are stains on the mirror, ether, alcohol level on the available cotton wool mixture (mixture ratio of 7:3) wipe gently, careful not to allow the alcohol to infiltrate inside the objective lens case lenses degumming. Hair