The sand retention apparatus is composed of an upper joint (1), a central tube (2), a retention ring (3), a sealing element (4), a spacing ring (5), an adjusting ring (6) and a bell mouth (7).

此种挡砂器由上接头(1)、中心管(2)、挡环(3)、密封件(4)、隔环(5)、调节环(6)和喇叭口(7)组成。

youdao

This nerve travels from your neck down your upper arm, wrapping around the elbow joint on its way to the hand.

这条神经从你的颈部开始下伸到你的上臂，在运行到你的手的过程中围绕过你的肘关节。

youdao

Rather than a flexible lower jaw joint, they had a hinge between the upper jaws and the rest of the skull.

他们没有可活动的下颌关节，而是有一条筋腱连接着上颚和头骨。

youdao

He replaced a portion of a rabbit's upper arm joint with a biomaterial scaffold, providing a place for cells to grow.

VOA: standard.2010.08.11

This new arthroplastic joint would be hammered into my upper arm and then cemented to my clavicle.

NPR: Excerpt: 'The Healing Of America'

Voting in joint session for president are both the lower and upper chambers of Parliament plus regional representatives.

NPR: Italian Lawmakers Pick Country's New President