Valida
n. 有效霉素
🗣️ 情景例句
Advertising, bills, bills, advertising.
广告 ，帐单 ，帐单 ，广告。
Working without a plan is sailing without a compass.
工作没有打算，犹如航海没有罗盘。
Maybe some folk songs to start with?
先演奏些民歌吗？