经研究发现：①悬浮物形态各异，有纤维状、羽毛状或头屑状，由一些金属和非金属化合物组成；
After a careful study, it is found that: (1) Suspensions created in various shapes such as fiber, plume and dandruff, are constituted of the compounds of metal and non metal;
分为软金属，金属化合物，非金属及其他无机物以及有机物质四大类。
Divided into soft metal, metal compounds, non-metallic and other inorganic and organic matter in four categories.
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