請問這幾種耳機的英文有否不同

earphone and earbud are the same thing. They are placed into your outer portion of your ear canal.


圖片參考：http://imgcld.yimg.com/8/n/AB07899828/o/151210110321713872026550.jpg


headphone is placed over your ears with a band bridge over your head


圖片參考：http://imgcld.yimg.com/8/n/AB07899828/o/151210110321713872026551.jpg

earphone耳機
earbud耳塞式耳機
headphone耳機頭戴送受話器，耳機。headpiece
名詞
1. 胄，盔，帽子，頭巾。
2. 才智。
3. 【印刷】(書的)扉頁；(章節開頭的)花飾。
4. ＝ headphone.

A：earphone (耳塞式)耳機 = earbud (耳塞式)耳機；headphone 頭戴式耳機；圖片：請參閱如上(個案例)。=====================================================================earphone (台1辭典)n. 耳機; 聽筒 (台2辭典查無) / (美辭典) n. (usually earphones)an electrical device worn on the ear to receive radio or telephone communications or to listen to a radio, MP3 player, etc.. / (日辭典) イヤホーン【earphone】⇒イヤホン。イヤホン【earphone】《「イヤホーン」とも》耳に差し込んだりかぶせたりして、ラジオやオーディオ機器などからの音声を聞くための器具。earbud (美辭典)noun (usually earbuds)very small headphone, worn inside the ear. / (台1, 2辭典、日辭典：查無)headphone (台1辭典)n. 頭戴式耳機 / (台2辭典)n. Either of a pair of telephone receivers held against the ears by a band across the head. (常用複數)耳機。 / (美辭典) (usually headphones)a device consisting of a pair of earphones joined by a band placed over the head, for listening to audio signals such as music or speech: 例. I sloshed along the shore listening to Mozart on my headphones (as modifier headphone) a headphone socket. / (日辭典)《「ヘッドフォン」とも》ラジオ・ステレオなどを聞く時に用いる。両耳をおおう形の小型のスピーカー。

2012-10-11 16:31:10 補充：
A2：耳機〈簡稱〉earphone (有單耳的和雙耳的)、earbud (有單耳的和雙耳的)、headphone (只有雙耳的)；(區分的或明確的名稱如A (A1) 回答。請注意英文單複數(加s)的用法(尤其是商品或考試的場合)。