Unicel
二亚硝基五亚甲基四胺(发泡剂)
🗣️ 情景例句
She took a medical course.
她选读医学课程。
No, not really. It doesn't make any difference.
没有，真的没有，没有不同看法。
Long ago, people believed that the world was flat.
很久以前人们相信地球是平的。