楼主说要ch但是发音要是 /shi/,可是楼主的举例 lunch 中的 'ch' 不发 /shi/的音,而是发 /chi/ 的音. sh 发/shi/的音有很多,如: sheep sheet shape shoot shot show dish fish shy shop share shoe cash trash she shell Washington wash Welsh dash splash cash rash rush shark fresh brush sunshine shame wish shrimp shade perish push shout 等等等等 ch 先说发 /shi/的音,如: chagrin Chicago parachute moustache machine Michigan brochure chauffeur chaise chalet champagne chambray chamois chandelier chapeau chaparral chaperone charade charlatan Charlotte chauvinist chef chemise chevron chiffon chivalry chute cache crochet ch 发 /chi/的音也很多,如: china cheap chip cheat teach kitchen chicken peach reach breach chat champion chew crunch brunch French check chain chair charming chase chalk child chilly chief touch search which launch 等等等等
温馨提示：答案为网友推荐，仅供参考