Butadiene
n. 丁二烯\\n[化] 丁二烯; 丁间二烯
🗣️ 情景例句
What power options are available? ( steering, brakes, windows.... )
（这种汽车）有中控系统吗？
When an opportunity is neglected,it never comes back to you.
机不可失，时不再来；机会一过，永不再来。
That makes no difference.
没什么区别。