当温度降至临界温度以下，某些金属会突然失去电阻，出现超导现象，这就是相变的一个例子。
The emergence of superconductivity in certain metals when cooled below a critical temperature is an example of a phase transition.
研究者称，飞机飞行将云温推至临界点以下，为那些过冷的液态水提供了云形成的冰颗粒，使其凝聚冻结。
As planes push cloud temperatures past the tipping point at which supercooled water freezes, the aircraft "seed" the clouds with ice particles, the study says.
恐龙的灭绝很可能是由于一颗巨大的流星导致地球温度降到了它们生存的临界值以下。
Dinosaurs were most likely wiped out by a giant meteor that cooled Earth's temperatures below their threshold for survival.
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