1·Above the stratosphere, blue layers mark the upper atmosphere (including the mesosphere, thermosphere, ionosphere, and exosphere) as it gradually fades into the blackness of outer space.
在大气层上，蓝色的部分表示上层大气(包括中间层、热层、电离层、外逸层)，它们渐渐消逝到外空间的黑暗中。
2·Thermosphere: Heating, density increase, expansion at high latitude.
热层：加热过程，密度增长，在高纬的扩张。
3·The thermosphere interacts strongly with the sun and hence is greatly influenced by the sun's solar activity, which occurs in cycles.
强烈的热层与太阳交互作用，因此受较大的周期发生的太阳活动影响。