1. Here's what a naturally-occuring noctilucent cloud looks like, for comparison 以下可以对比自然形成的夜光云看起来来是怎样的
2. 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。
3. The clouds are also called noctilucent, or "night-shining," clouds because they are usually seen at twilight. 这些云也被称为“noctilucent”，也就是“夜光云”，因为他们一般出现在黄昏时分。
4. 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。
5. Although noctilucent clouds are thought to be composed of small ice-coated particles, much remains unknown about them. 尽管我们认为夜光云由裹着冰的小微粒组成，但仍有许多未知有待研究。
