但研究发现，当手机使用人数达到1亿这个临界数量时，手机降低交通致命率的作用就消失了。
However, this reduction in fatalities disappeared once the Numbers of phones in use reached a "critical mass" of 100 million, the study found.
在通常的全动力应用下，内核里中子的产量是稳定的（保持一个数量不变），反应器处于临界状态。
During normal, full-power operation, the neutron population in a core is stable (remains the same) and the reactor is in a critical state.
最新的评估报道宣称，“公开的场景表明现在轨道上的残骸的数量已经达到了临界点。”
The latest evaluation report says: 'Scenarios uncovered conclude that the current orbital debris environment has already reached a 'tipping point'.
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