Then, clock falls low, so PER concentrations also drop again, allowing CLK to rise, starting the cycle over.

然后，时钟下降，因此 PER 浓度也再次下降，允许 CLK 上升，开始循环。

Runaway fires pour even more carbon into the air, which increases temperatures, starting the whole vicious cycle all over again.

失控的大火将更多的碳排放到空气中，从而升高温度， 重新开始整个恶性循环。

But the tipping makes a bubble rise through the liquid into the bird's head, sending more liquid into the bottom, and setting the little bird swinging, and starting the cycle all over again.

但是运动会使液体中的气泡上升 到鸟的头上，导致更多的攀爬。