Ppap
abbr. 生产件批准程序（Production Part Approval Process）
🗣️ 情景例句
When are they coming?
他们什么时候来？
Your friend was here a week ago,wasn't he?
一个星期前，你的朋友曾在这里，是不是？
From these he can go on to appreciate more complex forms or combinations of several forms.
从这些形体出发，观赏者可进一步观察更为复杂的形体或若干形体的组合。