由于井场所位于的山区地形下垫面特殊，气体扩散过程比较复杂。
As well located at the mountain terrain special surface, the gas diffusion process more complicated.
我们说话时，声波就开始传播，向四面八方扩散。
When we speak, sound waves begin to travel and go in all directions.
我们说话时，声波就开始传播，向四面八方扩散。
When we speak, sound waves begin to travel and go in all directions.
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