天花本身具有防静电功能，所以其表面是不会沾染尘埃，护理只需定期用清水轻抺即可（一般每月一次）。
Smallpox has anti-static function, so the surface is not contaminated with dust, just regular nursing with water to wipe light (usually once a month).
在水泥路面施工时，应用塑料膜将井盖盖好，以防止水泥浆沾染表面，损伤表面花纹、字迹。
In the cement pavement construction, application of plastic cover, to prevent contamination of the surface damage of cement slurry, the surface pattern and writing.
这项研究发现，五秒钟定律有一定道理，食物同表面接触时间越长，沾染的细菌就会越多。
The research found that the five-second rule has some validity in that longer contact times resulted in transfer of more bacteria.
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