✅ 同义词
🗣️ 情景例句
About the quality of 500 cartons of tin food we ordered last time.
是关于我们上次定购的500箱罐头食品的质量问题。
Did you hear something?
你听到了什么？
What happened before printing was invented?
印刷术发明以前是怎么一回事？