sun crust

例句：

1. 1.The sun's outer layer is known as the solar corona.
   太阳的外层被称为太阳外层。
2. 2. The sun's corona is a region of space where temperatures can reach extreme levels.
   太阳的外层是一片温度可以达到极端水平的太空区域。
3. 3.The sun's corona is responsible for many of the solar flares we experience.
   太阳的外层负责我们经历的许多太阳耀斑。