Preproduction
[化] 试验性生产
🗣️ 情景例句
Thank you, Grandpa.
谢谢你， 爷爷。
Many new ideas are discovered during college years.
大部分崭新的观念都产生于大学时代。
After a wonderful meal, they told stories and sang songs by the campfire.
他们美美地吃了一顿饭后，就围在营火旁讲起了故事，唱起了歌。