Some pistons have seating rings of metal or leather.

有些活塞上有金属或皮革的密封环。

youdao

And further research work should be conducted in the future. This paper is the continuation of "the discussion on the design of the lugs and end rings of metal bellows expansion..."

本文是《金属波纹管膨胀节端板设计问题讨论》和《金属波纹管膨胀节端板设计问题探讨》的继续。

youdao

And further research work should be conducted in the future. This paper is the continuation of "the discussion on the design of the lugs and end rings of metal bellows expansion joint".

本文是《金属波纹管膨胀节端板设计问题讨论》和《金属波纹管膨胀节端板设计问题探讨》的继续。

youdao

To overcome all this, LeRoy Olson, an engineer at the University of Washington, devised a barrel-shaped structure of metal rings.

ECONOMIST: 20,000 leagues under the sea

It rings off the metal corner of the desk like a horseshoe collaring a metal stake.

NPR: Excerpt: 'Nobody's Baby'