Predevelopment
前期开发; 预研
🗣️ 情景例句
Many business people turn off their pagers and cell phones during their leisure time.
许多商人在他们的休息时间里都把传呼机和移动电话关掉。
Are you free tomorrow?
你明天有空吗？
Yes, I have.I think that.I've hurt my back.
是啊，摔伤了。我想我把背摔坏了。