n. 贸易;行业;<美>顾客;买卖;
vt.& vi. 交易,经商;
vt. 交换;经营…交易,做…的买卖;
vi. 贸易;买卖;以物易物;
🗣️ 情景例句
How are you?... Here's Mom.
好吗 …… 妈妈就来了。
He who purposes to be an author, should first be a student.
想当作家,相当学生。
Up to now, historians have assumed that calendars came into being with the advent of agriculture, for then man was faced with a real need to understand something about the seasons.