A smart, fun countdown that details how ancient technology worked, how surprisingly advanced it was, and how it was kind of awesome.等(⏫)把炉子底下的木炭全部弄(🍑)出(chū )来之后，发现周围全是黑色的(de )，没(méi )有发现(🤠)(xiàn )有铜的迹象。