noctilucent

基本解釋

Noctilucent clouds were first observed in 1885 by an amateur astronomer.
1885年，一位業(yè)余天文學愛好者最早觀察到夜光云。
Noctilucent clouds are ragged extensions of a more widespread and more permanent layer which forms over the summer polar area at the mesopause.
夜光云是在夏季極地中圈頂之上形成的更廣泛更持久的層的參差不齊的延伸。
Although noctilucent clouds are thought to be composed of small ice-coated particles, much remains unknown about them.
盡管夜光云被認為是由細小的冰晶組成，但是很多關于云層的細節(jié)仍未知。
Rare earth noctilucent fibers are a kind of new materials, provided with special function.
稀土夜光纖維是一種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.
介紹了夜光粉和夜光釉的制作方法及其應用。

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