Polyreaction
聚合反应
🗣️ 情景例句
I'm a photographer.
我是一位摄影师。
What's your plan for the summer holiday?
暑假计划干什么？
Often a valley boasted no inn at all, and climbers found shelter wherever they could --
山谷里常常没有小客栈，登山者只好随遇而安。