他们发现了惊奇的一幕：超过某一临界值，增加关联会使系统能力突然降低，并在干扰后反弹。
They discovered something startling: that beyond a certain threshold, increasing the connectivity would suddenly decrease the ability of the system to rebound after disturbances.
临界点及二氧化碳肥沃作用的不确定性，必须成为农民适应气候变化和提高产量的能力需要考虑的事情。
Against the uncertainty over thresholds and CO2 fertilisation must be weighed farmers’ ability to adapt to change and improve yields.
由于越来越多的人涌进城市，城市服务与设施的承受能力已经到达临界点。
As people in mounting Numbers flood into cities, city services and facilities have been strained to a breaking point.
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