This is an endless chain.

这是条循环链。

youdao

New project of endless chain arrangement and design method for the FWM are presented.

本文提出了机械式缠绕机（FWM）环链布局的一种新方案和相应的设计方法。

youdao

A drive system for an internal combustion engine including an endless chain connecting a drive sprocket on a crankshaft to a driven sprocket on a camshaft.

一种用于内燃机的驱动系统，包括将曲轴上的主动链轮连接到凸轮轴上的从动链轮的一条环链。

youdao

We hated the way he constantly discussed what his clothing would have cost somebody who didn't have a perpetually post-college slump sister who worked a seemingly endless chain of men's retail jobs.

FORBES: Abstract

Faced with collapsing fish populations, whether the disappearance of the cod fishery on the Grand Banks off Newfoundland or the failure of the North Sea herring fisheries, the reaction has been one of half-hearted measures: too little done too late in a chain of endless procrastination excused by the need for ever more scientific research.

ECONOMIST: Salmon fishing