nonexistent

Pollution control measures are either not strict or nonexistent, leading to choking clouds of smog.

污染控制措施要么不严格要么不存在，导致了令人窒息的雾霾。

Your day is ruled by minutes and seconds, but these concepts are not real in any physical sense and are nonexistent to numberless people.

你的一天被分和秒所支配，但这些概念在任何物理意义上都是不真实的，对无数人来说都是不存在的。

Hygiene was nonexistent: no running water, no bathroom.

卫生根本不存在：没有自来水，没有浴室。

The evidence for Mozart therapy turned out to be weak, perhaps nonexistent, although the original study never claimed anything more than a temporary and limited effect.

莫扎特疗法的证据被证明是微弱的，也许根本不存在，尽管最初的研究从来没有做过任何声明，除了说有暂时的和有限的效果。

Or is it, rather, nonexistent?

还是这种机会根本就不存在？