Pronounced ruò (falling tone). The "Tang Yun" (Tang Yun) uses the characters "er" and "shao" for fanqie pronunciation. The "Ji Yun" (Ji Yun) uses the characters "ri" and "zhuo" for fanqie pronunciation. The pronunciation is the same as "ruò". "Shuowen Jiezi" (Shuowen Jiezi) explains it as: the outer layer is flesh, and the inner layer is skin. The character form uses "rou" as a radical, and "ruò" indicates both meaning and sound. "Guang Yun" (Guang Yun) explains it as: crisp and tender soft flesh. "Boyan" (Boyan) explains it as: 脋, which is flesh. It also says: it is a membrane.