快速列车
先理解核心含义，再看它在真实句子里的用法。
快速列车
A train that travels at high speed.
I prefer to take the fast train to save time.
我更喜欢坐快速列车以节省时间。
快速列车
A train that travels at high speed.
Use fast train naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
Dictionary facts from AI_SUPPLEMENT.