geodesic lune
测地二角形

The cardinal point and cardinal plane of lune thicklens.
弯月形厚透镜的基点和基面

Lune, on a bench, while looking at the map, says the following words.
琉璃，坐在长凳上，双目正注视地图然后说道。

Finally, the author proposes personal viewpoints on the musical interpretation of Clair de lune.
因而进一步探讨其创作灵感，并提出个人的诠释观点。