Mankind is facing an unprecedented severe challenge.

人类正面临前所未有的严峻挑战。

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Humanity's living environment is actually facing the unprecedented challenge.

人类的生存环境却面临着前所未有的挑战。

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Humanity's living environment is actually facing the unprecedented challenge.

人类的生存环境却面临着前所未有的挑战。

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