Polyacetylenes
多炔
🗣️ 情景例句
And I've got some delicious Danish pastry for you.
我为你们准备了一些可口的丹麦点心。
He's a student.
他是学生。
Dad, this is Li Lei. Li Lei, this is my father.
爸爸，这是李磊，李磊，这是我爸爸。