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。
No matter in China or in other foreign countries, ghost is constantly being talked about.
无论在中国还是在国外，鬼之类的东西都常常被谈论。
Before installing, flush out pipe lines to remove scale and other foreign matter.
在安装之前，要冲洗管线，清除水垢和其他外来杂质。
Before installing, flush out pipe lines to remove scale and other foreign matter.
在安装之前，要冲洗管线，清除水垢和其他外来杂质。
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