名詞 headphone:

1. electro-acoustic transducer for converting electric signals into sounds; it is held over or inserted into the ear
   同義詞：earphone, earpiece, phone

head.phone

n.（名詞）
A receiver, as for a telephone, radio, or stereo, held to the ear by a headband.
頭戴式受話器，耳機(jī)：用頭環(huán)套在耳朵上的用于接收電話、收音機(jī)或立體聲等的接受器