第类，高虫口密度、高被害株率、中拥挤度。
High insect density, high attacked trees rate, middle crowded degree.
将唇口滑动而上的传热归结为第二类边界条件；
The authors assume that the heat flux at the sliding surface of the lip occurs for the second boundary condition.
鳗类，鳗：无颚的各种原始水生圆口纲脊椎动物中的一种，包括七鳃鳗和盲鳗。
Any of various primitive aquatic vertebrates of the class Cyclostomata, lacking jaws and including the lampreys and hagfishes.
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