Olefin
n. 石蜡, 烯烃\\n[化] 烯烃
🗣️ 情景例句
in your tuxedo jacket pocket.
礼服上衣口袋 。
Tell us about your post-purchase servicing.
告诉我们有关你们售后服务的情况。
We're having a lot of trouble filling this order.
我们这次供货很有问题。