Phase velocity
[化] 相速
🧩 词语组成解析
🗣️ 情景例句
OK, sir, just sit tight, and we'll have an ambulance there in about ten minutes.
好的，先生。你就在那边等着，救护车10分钟之内到。
What does the test marketing show?
试销说明了什么？
I'll be more careful next time.
我下次要更小心一些。