Phase velocity
[化] 相速
🧩 词语组成解析
🗣️ 情景例句
I'm not letting you get behind the wheel until you've sobered up.
除非你完全清醒了我才会让你开车。
Once a knave,ever a knave.
一次成无赖，永远是无赖。
Portable boiling elements that can boil small quantities of water are useful when the right voltage of electricity is available.
如果有相配的电压，可以煮少量水的便携式热水装置是有用的。