The Longquan sword which the PRC presented to President Nixon at the time of the "normalization" of Sino-US relations has a scabbard covered with snake skin, and not the shark skin which was used for high-quality swords in ancient times.
「中美關係正常化」的時候，中共送給尼克森的禮物「龍泉劍」，劍鞘包的是蛇皮，而不是歷代高級刀劍通用的鮫魚皮。