The idea is that this is designed to give a hook that implementors can make cheap to poll.

其思想是提供一个钩子供实现者进行低廉的轮询。

youdao

If you have a sharp object to use as a hook, a shoelace can make a decent fishing line.

如果你有什么尖利的东西能做鱼钩，鞋带就可以当钓鱼线。

youdao

These things tend to make money, but the main goal is to hook readers on a bundle of services.

这些事情可以盈利，但主要目标是用捆绑销售来留住读者。

youdao

And they certainly make for a nice marketing hook in today's increasingly cluttered landscape.

FORBES: Buzz - Forbes.com

James Hook will make a shock appearance against South Africa but Shane Williams will miss all three matches.

BBC: Wales suffer Andy Powell injury blow

There will probably be accusations of some sort of mismanagement used as a hook to make claims about the board of directors being asleep at the switch.

FORBES: Financial Crisis, Legal Boom