siu的音标
整体发音不一样，sh和f的发音一样
sheep 英[?i:p] 美[?ip]
n. 羊，绵羊; 胆小鬼; 易受人摆布的人; 缺乏主见或轻易盲从的人;
[例句]Sheep's milk is produced in much the same way as goat's milk.
绵羊奶和山羊奶的生产过程差不多。
fish 英[f?] 美[f?]
n. 鱼，鱼肉，鱼类; 〈口〉（特殊的）人物，家伙，东西; [建] 接合板，夹片，鱼尾板; [航] 钓锚器，撑夹桅杆的加固夹箍;
vt. 钓鱼; 捕鱼; 摸出; 掏出;
vt. 钓鱼，捕鱼; 搜寻; [航] 加夹箍夹牢; [工]用接合板连接[加固] ;
[例句]I was chatting to an islander who had just caught a fish