adj.外殼的
n.外殼
A microphone inside each muff senses sound waves that make it through the outer ear cup, and a speaker creates pressure waves that cancel them. 耳機罩內(nèi)的麥克風(fēng)負責(zé)感應(yīng)傳入耳機外殼的聲波，喇叭負責(zé)制造壓力波予以抵消。
用作名詞 (n.)The turtle has a very hard shell. 烏龜有很堅硬的外殼。
Its thin outer shell had protected its liquid interior. 它薄薄的外殼保護著它呈液體的內(nèi)臟。
