以 f ç»å°¾çåè¯ : å¤æ°æ¶ f æ¹ä¸º ves
å¦ : calf => calves, elf => elves, half => halves, scarf => scarves, shelf => shelves, thief => thieves
以 fe ç»å°¾çåè¯ :: å¤æ°æ¶ fe æ¹ä¸º ves
å¦ : knife => knives, life => lives, wife => wives
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