The hard shell on a beetle is an outside protection, as is the "skin", called cuticle, of an earthworm.

甲壳虫身上的硬壳是外表保护层，就像蚯蚓的“皮肤”，它叫角质层。

youdao

I can't get an outside line.

我接不通外线。

《牛津词典》

They have only an outside chance of winning.

他们的胜算极小。

《牛津词典》

There is very little research that that chartering or bringing in an outside management company may get you better results.

VOA: special.2010.03.18

Then an outside raider comes in and just fires the employee so naturally the employee feels wronged.

然后公司外的一个蓄意收购者来到公司,将这位雇员解雇,于是自然地，这位雇员会感到委屈冤枉。

耶鲁公开课 - 金融市场课程节选

There's a phone in Buddy and Seymour's old room that is a private internal line, and it just goes from one room to another in the apartment; it's not an outside phone line.

在巴蒂和西莫的就房间里，有一台电话,有一个私人的内部线路，在公寓里的房间联通,不与外界相连。

耶鲁公开课 - 1945年后的美国小说课程节选

Why would an orthodontist agree to give away 40% of his operating income to an outside firm?

FORBES: Brace Yourself

Tests are double-checked biopsy tissues are sent to an outside pathologist, MRIs to another radiologist.

WSJ: The Weekend Interview with Leslie Michelson: Doctor to the 1% (and Maybe Someday to You)

We thought the message might get through better if we brought in an outside expert.

BBC: NEWS | UK | Education | SAS man teaches city survival