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數(shù)學(xué)的本質(zhì)在于其自由性。

Coal enterprises must enhance their sense of social responsibility and achieve the unity of economic and social benefits.

真相很少是純粹的，也絕不簡單。

I'm not going to keep on knocking that old door that doesn't open for me. I'm going to create my own door and walk through that.

"The more you try to control the mirror, the more it controls you."