sunspot theory

例句：

1. 1. The sunspot theory suggests that the sun's surface is constantly changing due to solar flares.
   太阳黑子假说认为，太阳表面由于太阳耀斑而不断变化。
2. 2. This theory has been widely accepted by scientists and has greatly influenced our understanding of the sun.
   这一理论被科学家广泛接受，并极大地影响了我们对太阳的理解。
3. 3. In recent years, new evidence has challenged the traditional sunspot theory, leading some researchers to reevaluate its validity.
   近年来，新的证据挑战了传统的太阳黑子假说，促使一些研究人员重新评估其有效性。