由于微粒极易吸入，煤灰对人体危害很大。
The ash is highly hazardous to people, as the fine particles are easily inhaled.
铬化合物对人体危害的主要表现在鼻部，可致鼻中隔糜烂、溃疡、穿孔。
The health hazard of the chromium compounds was mainly manifested in nose, eliciting fester, ulcer, perforation of nasal septum.
目的：为解决采用微波加热回流进行实验时微波泄漏对人体危害的问题，并实现远距离自动操作。
Objective: to solve the problem of the harm of microwave leak when doing microwave circumfluence experiment and carry out the automation in far distance.
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