Polyacetal
[化] 聚缩醛
🗣️ 情景例句
She's winning!
她赢了！
In secondary school, children study history and geography.
中学的小孩会读历史和地理。
there is no evidence that the total amount of activity is any less.
但没有迹象表明，其活动总量有任何减少。