cometary coma的用法和樣例：
例句
- The molecules of the comet's gaseous coma fluoresce in sunlight.
彗星氣態彗發里的分子被陽光激發而發光。 - For the next few days, its short tail and bright coma can be spotted with the unaided eye close to the Sun and near the horizon in both evening and morning skies.
今後數天，在傍晚和早晨接近地平線的天空中在太陽附近，人們能用肉眼看到該彗星短小的彗尾和明亮的彗發。
