外殻的英文：
a case or shell; outer covering or casing; a skin; an envelope; a crust

shell是什么意思：
n. 殼；外殼；外形；炮彈
v. 剝殼；剝落
  • shell collecting
    貝殼采集
  • The snail retreated into its shell.
    蝸?？s進(jìn)殼里去了。
  • reactivation of quoted shell company
    上市空殼公司恢復(fù)業(yè)務(wù)
outer是什么意思：
adj. 外面的，外部的；客觀外界的
  • bearing outer race
    軸承外座圈
  • He disclosed the outer covering on the bike.
    他揭去自行車上的覆蓋物。
  • He heard a voice in the outer room.
    他聽(tīng)到外屋有人說(shuō)話。
covering是什么意思：
n. 遮蓋物；遮蓋層
v. cover的現(xiàn)在分詞
  • Cover as if with a shroud.
    仿佛用覆蓋物掩飾著。
  • To be covered with or as if with fog.
    為霧籠罩被或好象被煙霧掩蓋
  • Covering: The fixing of a book cover to the spine and end papers .
    上書皮:把書皮粘貼于書和紙上。

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