Olefins
n. 烯烃; 链烯
🗣️ 情景例句
Thank you.
谢谢。
Martha's bread tastes as if she burns it.
玛莎做的面包有烤焦的味道。
So archaeologists have neither history nor legends to help them to find out where the first 'modern men' came from.
于是，考古学家们既缺乏历史记载，又无口头传说来帮助他们弄清最早的“现代人”是从哪里来的。