When cave, as a kind of natural geomorphologic landscape, is developed and utilized by human being as a kind of tourism resource, we call it tourism cave.

洞穴作为一种自然地貌景观被人们开发利用而成为一种旅游资源时，我们就称之为旅游洞穴。

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In addition to the petroleum geologic conditions, the main causes are also related with the properties of near surface sediments and the geographical and geomorphologic landscape conditions.

其主要原因除与油气地质条件相关外，还取决于近地表沉积物的性质，以及地理、地貌的景观条件。

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