三十辐共一毂,当其无,有车之用。埏埴以为器,当其无,有器之用。凿户牖以为室,当其无,有室之用。故有之以为利,无之以为用。 Thirty spokes share one hub. Where the wheel is not, that is where the cart is useful. Clay is shaped into a vessel. Where the vessel is no
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