Facts have revealed that vacuum suction is a natural physical phenomenon in covered Karst areas.
许多事实证明，真空吸蚀作用是覆盖型岩溶地区一种自然物理作用。
Based on the principle of suction, a natural aeration method is proposed for prevention of Karst collapse, which has been tried in some areas in China with satisfactory results.
在真空吸蚀原理的基础上，提出了防治塌陷的自然充气法，在中国某些地区试验效果良好。
The vegetation types and coverage rates were the most important and sensitive natural factors because of the vulnerability in karst areas.
岩溶生态系统是一种脆弱的生态系统，植被类型与盖度成为岩溶环境中最重要、最敏感的自然要素。
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