So how did the original maker get the pattern on there? Having repeatedly thought about this problem, Cheng concluded that prehistoric potters must have used an internal mold when working. Perhaps they had shards that they could just pick up from the ground around them.
他反覆思考，認為史前陶者在製作時一定有一個內模，可能是隨手撿拾起身邊一個破掉的陶甕來支撐。