Cyclodiolefin
[機] 環二烯烴
??? 情景例句
Not so good, Grandpa.
情況不太好， 爺爺。
Believe it or not!
信不信由你。
It has always been a mystery to me who city dwellers, who appreciate all these things, obstinately pretend that they would prefer to live in the country.
城里人對這一切心里很明白，卻偏要執拗地裝出他們喜歡住在鄉村的樣子，這對我來說一直是個謎。