Refringency
折射系数
🗣️ 情景例句
May I help you, sir?
需要我帮忙吗，先生？
We've booked a Western-style room for you.
我们已为你订了一间西式的房间。
and the railway of the future may well be the 'hovertrain',
未来的火车或许能成为气垫火车，