Refringency
折射系数
🗣️ 情景例句
Oh! My, how he's grown!
噢， 天啊， 他长这么大了！
Little children have the most fun playing make-believe.
儿童很喜欢幻想的游戏。
Because the gravity on the Moon's surface is only a sixth of Earth's
由于月球表面的重力仅是地球表面的1/6-