Yuban
脲、甲醛聚合物
🗣️ 情景例句
No, thank you.
不用 谢谢你。
He was always called as genius.
他总被人们称为“天才”。
Portable boiling elements that can boil small quantities of water are useful when the right voltage of electricity is available.
如果有相配的电压，可以煮少量水的便携式热水装置是有用的。