shallow pay producing 浅层开采
shallow gas pay 浅气层
·2,447,543篇论文数据，部分数据来源于NoteExpress
The rover hit pay dirt early, landing inside a shallow crater ringed in layered rock outcroppings.
CNN: Mars rovers working overtime
The public debate over making drivers pay to use the roads has been as shallow in Chicago as in the rest of America.
ECONOMIST: Transport in Chicago
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