The contract is open-ended.

本合同是无限期的。

《牛津词典》

The essay is something you can still control, and it's open-ended.

论文是你仍然可以控制的东西，而且它是开放式的。

youdao

Human language is productive, an open-ended communication system, whereas no other communication system has this property.

人类的语言是多产的，是一个开放的交流系统，而其他交流系统都没有这种特性。

youdao

Gibbs also says Mr.Obama wants benchmarks for evaluating U.S.progress in Afghanistan, and will not commit to an open-ended conflict.

VOA: standard.2009.11.13

you can open your eyes again, so now what happened, We ended up with two centrist candidates.

你们可以睁开眼睛了,现在发生了什么,我们有两个中间派候选人

耶鲁公开课 - 博弈论课程节选

you could leave your response to the invitation slightly open-ended by saying you're not sure.

你可以表示你不确定，开放性地回复这个邀请。

I don't know 课堂 - SpeakingMax英语口语达人

It is open ended and as we all know markets cannot deal very well with uncertainty.

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Only a few weeks ago, ECB chief Mario Draghi announced his own open ended bond-buying plan, dubbed Outright Monetary Transaction.

FORBES: Fed To Markets: Take Some QE3, There's A Lot More Where That Came From

Details on the game are vague so far, though it promises to be an open ended game, set in outer space.

FORBES: Mojang Registers Website For Its New Game '0x10c'