“外层”的英语可以翻译为：[化] outer sphere，[医] strata externum ...

“外层”的反义词：内层。...

1957年，苏联人将“斯普特尼克1号”人造卫星送入了外层空间。In 1957, the Soviets launched Sputnik 1 into outer space.椅子外层是人造兽皮。The chairs were covered in faux animal skin.来自外层空间的无线电波radio waves from outer space...

“外层瘤”的英语可以翻译为：[医] lepidic tumor，lepidoma，rind tumor ...