I have mixed thoughts on the D-ring which Maxpedition has been using for a while.

我一直对马盖先使用的这个D环设计有更多的想法。

youdao

Moreover, parent compound 2.11 was designed by changing hybridization of carbon which attached with the pyranone D-ring at 7-position.

再次，通过改变与吡喃酮环相连的亚甲基碳原子的电子云杂化状态，设计了化合物类型2.11。

youdao

If the pilot had to pull the "d" ring (ejection handle) in an emergency, the cables would snap the wearer's feet back under the seat to ensure a smooth and safe ejection from the aircraft.

当发生紧急情况，飞行员需要弹射时，缆绳会将马刺佩戴者的足部从座椅下方拉出来，以确保弹射安全。

youdao

Some of it's not taking urgently enough some of these commitments and we'd like to see, for example, infrastructure spending kicked up and then ring-fenced.

BBC: Business group lists 15 ideas 'to boost the UK economy'

He has explored crystal growth, and developed, with a specialist in nature-related algorithms, a 3-D program mimicking the way crystals actually grow over millions of years (with this particular program, he and the scientists he has been working with made virtual crystals grow directly on a ring-like structure on their computer, almost instantly, then manufactured them with a 3-D printer).

WSJ: Ringing the Changes