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Labor is work that leaves no trace behind it when it is finished, or if it does, as in the case of the tilled field, this product of human activity requires still more labor, incessant, tireless labor, to maintain its identity as a "work" of man.

劳动是一种完成后不留痕迹的劳动，即使完成了，也不会留下任何痕迹，就像耕种过的田地一样，这种人类活动的产物需要更多的劳动，不断的、不知疲倦的劳动，才能保持它作为人类“劳动”的身份。

— Mary McCarthy 玛丽麦卡锡