三(sān)十(shí)辐(fú)共(gòng)一(yī)毂(gū),
当(dāng)其(qí)无(wú),有(yǒu)车(chē)之(zhī)用(yòng).
埏(shān)埴(zhí)以(yǐ)为(wéi)器(qì),
当(dāng)其(qí)无(wú),有(yǒu)器(qì)之(zhī)用(yòng).
凿(záo)户(hù)牖(yǒu)以(yǐ)为(wéi)室(shì),
当(dāng)其(qí)无(wú),有(yǒu)室(shì)之(zhī)用(yòng).
故(gù)有(yǒu)之(zhī)以(yǐ)为(wéi)利(lì),
无(wú)之(zhī)以(yǐ)为(wéi)用(yòng).