That's because the atmosphere is more stable — hurricanes need unstable air to get going.

这是因为大气层更稳定了，而飓风活动需要不稳定的空气。

As the warm seawater evaporates, it contributes to the moist, unstable air that is a prerequisite for hurricane formation.

随着温暖的海水蒸发，它有助于潮湿，不稳定的空气，这是飓风形成的先决条件。