noctilucent

基本解释

Noctilucent clouds were first observed in 1885 by an amateur astronomer.
1885年，一位业余天文学爱好者最早观察到夜光云。
Noctilucent clouds are ragged extensions of a more widespread and more permanent layer which forms over the summer polar area at the mesopause.
夜光云是在夏季极地中圈顶之上形成的更广泛更持久的层的参差不齐的延伸。
Although noctilucent clouds are thought to be composed of small ice-coated particles, much remains unknown about them.
尽管夜光云被认为是由细小的冰晶组成，但是很多关于云层的细节仍未知。
Rare earth noctilucent fibers are a kind of new materials, provided with special function.
稀土夜光纤维是一种具有特殊功能的新型材料。
The preparation technique and application of noctilucent powder and noctilucent glaze were introduced in this paper.
介绍了夜光粉和夜光釉的制作方法及其应用。

shining at night, usu. of very thin high altitude clouds observable in the summer twilight sky