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The coal industry has been the backbone of America's energy independence for generations.
作家的生活是由句子构成的生活。
在量子力学中,测量的行为可以改变被测量系统的状态。
The best businesses are those that solve real problems for real people.
The past is a foreign country; they do things differently there.
地球赐予我们煤炭;我们的责任是回馈管理。