煤炭其实是一种成本低廉的能源，但对它的采挖却耗资巨大。
Coal is indeed a cheap source of energy, but its extraction is extremely costly to the environment.
由于耕作技术的改变和常年采挖，半夏野生资源逐渐减少。
Owing to change of farming technic and perennial dug, the resource of escape Pinellia Tuber is decreasing.
图片来源：GETTY 1849年淘金热中加利福尼亚的黄金采挖人。
Photo: GETTY Gold prospectors in California during the Gold Rush of 1849.
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