Olefine
[化] 烯烃; 链烯烃
🗣️ 情景例句
But I have promises to keep,
但是我有约要赴
I'll call the roll before class.
课前我要点名。
When reports came into London Zoo that a wild puma had been spotted forty-five miles south of London, they were not taken seriously.
当伦敦动物园接到报告说，在伦敦以南45英里处发现一只美洲狮时，这些报告并没有受到重视。