Fiesen's light

例句：

1. 1. The Fiesen's light is a crucial toolfor astronomy.
   费森氏光是天文学中至关重要的工具。
2. 2. The Fiesen's light has been usedto study the behavior of stars.
   费森氏光被用来研究恒星的行为。
3. 3. TheFiesen's light was discoveredby a German scientist in the 19th century.
   费森氏光是由一位德国科学家在19世纪发现的。