“白雪公主”“七个小矮人”用英文怎么说以“y”结尾的单词变复数，不是应该去“y”变“ves”吗？为什么会是“dwarfs”

白雪公主:
1. Snow White
七个小矮人:
the Seven Dwarfs

Snow White
The Seven Dwarfs
以-f或-fe结尾的词可变为-ves,如half--halves.
还有的只加s,如belief--beliefs.
还有的两种都可以,如dwarf,hoof,scarf等.

Snow White and the Seven Dwarfs

Snowwhite, seven dwarfs

snow white --白雪公主
seven little dwarfs --七个小矮人
Do you know the story of Snow White? Well，she was the prettiest girl in the kingdom!
But a jealous queen wanted to put her in jail to hide her beauty.
So she ran to the forest home of seven little dwarfs
“You’re welcome to hide here at our house!”
They all exclaimed.
But the ugly queen found her! She dressed up like an old beggar woman and gave
Show White an enchanted apple.
She took one bite and fell into a deep sleep.
The little dwarfs cried because they couldn’t awaken Snow White
So the dwarfs put her in a glass case and prayed for help.
One day，their prayers were answered when a handsome prince cane by and awakened Snow White with a magic kiss.
Snow White was so happy，and all the dwarfs yelled “Hooray!” And she and the prince got married the very next day.

snow white （白雪公主）and the seven dwarfs（七个小矮人）

"Snow White”
“seven dwarves”
有些有特殊的,比如scarf,可以直接加,也可以去“y”变“ves”.
我给的答案还是比较准的,要给我分!^^(但愿能帮上你的忙!)

"Snow White"
"the Seven Tiny Men"