The outer skin of the orange is called the "zest."

橙子外层皮叫“橙皮”。

《柯林斯英汉双解大词典》

Even the planet's outer skin, or lithosphere, has been transformed.

甚至于地球的表层——岩石圈——也已经被改变了。

youdao

For example, another idea involves an aircraft outer skin that can repair itself.

例如，另一个想法包括飞机外层可以自我修理。

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They float on pieces of the Earth's outer skin,or crust.

VOA: special.2010.01.12

When one imagines that a talent that great and a person with that much inner and outer beauty could have had obstacles simply because of the color of her skin, it makes me weep."

VOA: standard.2010.05.15

Farmers cultivate the toquillales and harvest the stems before separating the fibre from the outer skin.

UNESCO: MEDIA SERVICES

Proponents of rigid airships also claim that their babies are more resilient, thanks to the protective outer skin which shields the gas compartments.

ECONOMIST: Pushing the envelope

It caused her outer skin layer to deteriorate and burn off, leaving at least 60 percent of her body as an open wound.

NPR: Court: Can Generic Drug Maker Be Sued Over Design?