耳朵的英文单词怎么写

　　The dog scratched itself behind the ear.

　　狗用爪子挠挠耳后。

　　She whispered something in his ear.

　　她对他耳语了几句。

　　Hard hats and ear protectors are provided.

　　提供安全帽和护耳。

　　The whistle was inaudible to the human ear.

　　这种啸声人耳听不到。