The one snag on the lander happened when the protective sheath around the robotic arm didn't unwrap all the way after touchdown.

唯一的故障就是在探测器着陆后包围机械手臂的保护罩始终没能打开。

youdao

The spiral protective sheath for the rubber tube with good elasticity is more in favor of being installed outside an oil pipe, and has longer service life.

月牙结构，相对传统的 特别加厚和直板技术，也更加富有弹性。弹性好的胶管螺旋保护套更有利于安 装在油管外面，且寿命更长。

youdao

A bare winter tree, a holdout on cement-bound Third Avenue in New York City, emerges from an unlikely square of bricks, its base encased in a protective sheath.

冬天光秃的树，水泥边框里树槽，暴露在零乱的广场砖中，被保护圆套包围着。

youdao

One is a protective sheath that keeps cells alive for months outside a host body, nourished by a layer of fat.

FORBES: The Science of Small

In MS, the protective sheath or layer around nerves, called myelin, comes under attack which, in turn, leaves the nerves open to damage.

BBC: Simple eye scan can reveal extent of Multiple Sclerosis

"This number is a reminder that for the last 150 years and especially over the last several decades we have been recklessly polluting the protective sheath of atmosphere that surrounds the Earth and protects the conditions that have fostered the flourishing of our civilization, " Gore said in a statement.

NPR: Greenhouse Gas Milestone; CO2 Levels Set Record