Phase velocity
[化] 相速
🧩 词语组成解析
🗣️ 情景例句
This job offers me a real challenge.
这项工作对我构成真正的挑战。
No man can be a good ruler unless he has first been ruled.
没受过他人的统治，就不能很好地统治他人。
If one law is changed, then people will later want to change other laws.
要是变更了一条法律，那么人们还会要变更别的法律的。