... Propylite 青盘岩 Protective filter 保护滤层 Proving ring 衡圈、计力圈 ...
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lasing protective filter 激光防护滤光片
protective filter with 3 purposes 三防滤网
protective mask filter 防护面罩滤器
filter type protective mask 过滤式防毒面具
·2,447,543篇论文数据，部分数据来源于NoteExpress
Ozone provides a natural protective filter against harmful ultra-violet rays from the sun, which can cause sunburn, cataracts and skin cancer as well as damage vegetation.
臭氧提供天然的保护，防止太阳的有害紫外线的侵害，这种紫外线会导致晒斑，白内障，皮肤癌以及危害植物。
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A protective coating of colloidal silver is painted on the inside and outside of the filter to kill bacteria.
VOA: special.2009.06.22
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