Polyethyleneimine
聚乙烯亚胺
🗣️ 情景例句
What about the rings?
戒指怎么办？
Let me give you a little fatherly advice.
让我给你有点如父亲般的忠告。
Postcards always spoil my holidays.
明信片总搅得我假日不得安宁。