整體發音不壹樣，sh和f的發音壹樣
sheep 英[?i:p] 美[?ip]
n. 羊，綿羊; 膽小鬼; 易受人擺布的人; 缺乏主見或輕易盲從的人;
[例句]Sheep's milk is produced in much the same way as goat's milk.
綿羊奶和山羊奶的生產過程差不多。
fish 英[f?] 美[f?]
n. 魚，魚肉，魚類; 〈口〉（特殊的）人物，家夥，東西; [建] 接合板，夾片，魚尾板; [航] 釣錨器，撐夾桅桿的加固夾箍;
vt. 釣魚; 捕魚; 摸出; 掏出;
vt. 釣魚，捕魚; 搜尋; [航] 加夾箍夾牢; [工]用接合板連接[加固] ;
[例句]I was chatting to an islander who had just caught a fish