Despite the precision and skill with which these instruments were crafted, the lack of detailed written records inevitably raises doubts in people's minds: if the Chinese really did have such advanced astronomical instruments and clocks a thousand years ago, why was the art of making them lost to people of later times?
雖然儀器精巧，但是文獻記錄不夠詳盡，難免啟人疑竇：如果中國真的早在一千年前就有那麼進步的天文儀器和時鐘，為什麼後人反而做不出來呢？