Notice that each level only communicates with the level above or below.

注意每个级别仅仅与它上面或者下面的级别通信。

youdao

And that controversy leads to another one. Does Darwinian selection take place at the level only of individuals, or of groups as well?

争论最后集中到这样一个问题上，达尔文的物竞天择究竟是只发生在个体层面上，还是在群体层面上依旧有效。

youdao

The concept relies on the fact that the ear not only senses sound but also makes noises of its own, albeit at a level only detectable by supersensitive microphones.

这一设想的依据是：人耳不仅只是感知声音，它自己也同时在发出声音，即使其强度只有超灵敏拾音器才能侦测到。

youdao

Still,this would only mean that there are community-level outbreaks in at least one other country in a different area of the world.

VOA: special.2009.05.06

Not only now, but, I think, on some level it has always struck some of its readers as ludicrous.

不仅是在现在，我觉得，一直以来都有读者,会觉得这是荒唐可笑的。

耶鲁公开课 - 弥尔顿课程节选

If I had lists of lists of lists, then it would only take out the first level of it.

贴到另外一个数组的后面，它当然是实现了套数组的操作。

麻省理工公开课 - 计算机科学及编程导论课程节选

At national level only a few mobile telephone operators joined the exercise.

UNESCO: Social and Human Sciences

The report also says passenger satisfaction with punctuality and reliability has risen 2% to 83%, a level only achieved once before, in autumn 2009.

BBC: UK

Right now, private firms at the state level only produce drinking water (an immensely profitable enterprise) and shy away from distributing it (a sure money-loser).

CNN: Special Report Drought