A tentative analysis of the mechanism of mantle circulation flow, continent drifting and earthquake origin is first clearly made, giving a simple mechanics-based explanation of the nature.
首先对地幔对流、大陆漂移和地震起源的机制做了尝试性分析,给出一个简单的力学解释。
I'm going to now start doing simple problems in mechanics.
现在我来讲解几个简单的力学题目
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