Blow out lines to remove all loose scale and other foreign matter that can damage valve seat.
向管道吹气，清除所有疏松鳞锈和可能损害阀门阀座的其他外部杂质。
It can also contain pus, blood, fibrin, bacterial products or other foreign matter.
它还含有脓，血液，纤维，细菌产物或其他外来物质。
Dust and other foreign matter can get inside a DSLR when you change lenses.
当你更换镜头的时候，灰尘和其他异物有可以会掉进DSLR的里面。
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