Phase velocity
[化] 相速
🧩 词语组成解析
🗣️ 情景例句
Well, I almost had a heart attack a few moments ago.
好啦，我几乎要得心脏病了。
We kept on discussing the problem for four hours.
我们持续讨论那个问题达四小时。
Such inns as there were generally dirty and flea-ridden;
那里的小客栈一般都很肮脏，而且跳蚤猖獗。