Polypentamethylene sebacamide
[化] 聚亚戊基癸二酰胺
🗣️ 情景例句
Thanks, Dad.
谢谢，爸爸。
To worry about tomorrow is to be unhappy today.
担心明天，今天就不愉快了。
Are there any boats in the picture?
画里面有船吗？