Prodan
氟硅酸钠
🗣️ 情景例句
An apple a day keeps the doctor away.
每天一个苹果不用看医生。
Plants of learning must be watered with the rain of tears.
知识的幼苗要用泪雨来浇灌。
Pupils of the school, old and new, will be sending him a present to mark the occasion.
为了纪念这个日子，学校的学生——无论老同学还是新同学——将送他一件礼物。