表面开采，地下开采，煤或金属采矿行业之间的流动性可能会因生产技术和许可要求的差异而受限制。
Mobility between surface mining, underground mining, coal or metal mining sectors may be limited by differences in production technologies and licensing requirements.
但是人们通过采矿的活动，把地底的各种重金属释放出来，进入人们的日常活动中，进而在地球表面沉积。
Through mining activities, we release all kinds of underground metals from the ground, they enter into the daily lives of people and are deposited on the surface of the earth.
但是人们通过采矿的活动，把地底的各种重金属释放出来，进入人们的日常活动中，进而在地球表面沉积。
Through mining activities, we release all kinds of underground metals from the ground, they enter into the daily lives of people and are deposited on the surface of the earth.
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