背景目前，我国职业危害重点仍然是化学毒物、噪声与粉尘等职业有害因素。
BackgroundAt present, chemicals, noise and dusts still are main occupational hazards in workplaces.
环境中的气、水和粉尘等侵入设备会污染工作介质，影响产品质量和缩短机器寿命。
The water , gas, and powder of surroundings can invade into equipments so as to pollute the medium, influence the product quality, and shorten the service life of the machines .
结果表明：不同林地栽培模式在改变光照度、降低噪音、吸滞粉尘等环境效应上差异显著。
The results showed that there were significant differences in changing sunlight intensity, reducing noise, and accumulating dust in different forest land cultivation mode.
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