改进题：At the same time,another kind of paper was developed, made from silk.

译文：与此同时另一种纸被研究了出来，它用蚕丝制成。
改进题：At the same time,another kind of paper was developed, made from silk.

译文：与此同时另一种纸被研究了出来，它用蚕丝制成。
【正确答案】：改进的译文：与此同时还研制出另一种纸，就是用丝制的帛。
【题目解析】：p28
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