As far as the large workshop with changeable dust is concerned , the general ventilation is expensive , depletive , and , at the same time , ca n ' t meet the request of environmental protection 但是，对于有变动尘源的高大厂房而言，采用全面通风不但运行费用高、耗能大，而且不能满足环保节能的要求。
2.
The humanity in order to pursue the economic interest , has carried on the non - limit claim to the nature and the depletive development , has brought the serious destruction for the ecological environment and threatens and is affecting the society stable and development 摘要人类为了追求经济利益，对自然进行了无限度的开发，给生态环境带来了严重的破坏并威胁和影响着社会的稳定与发展。
