If the young Sun was much fainter and cooler than the Sun today, liquid water couldn't have existed on either planet.
如果早期的太阳比现在的太阳暗淡，也没有现在这么炙热的话，那么液态水就不可能在这两个星球上存在。
2
This turns the refrigerant back into its coolerliquid state to be used again.
这又将制冷剂变回原先的较冷的液态，从而可以再利用。
3
Although after cooler will water vapor condensation into a liquid make temperature decrease, but for the following two reasons from after cooler out air can still see the liquid water.