There is a valley between two mountains and there is a trough between two waves.
两山之间有一谷，西波之间有一伏。
In combination with exploration and development of gas field, the methods of distinguishing ancient valley trough is proposed after analysis of forming condition of ancient valley trough.
本文结合气田勘探开发实践，分析了古沟槽形成条件，提出了古沟槽判识方法。
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