Heptalene
庚間三烯并庚間三烯, 庚搭烯
??? 情景例句
I see him on the train every day but we are not on speaking terms.
我每天都在火車上見到他，但彼此沒有說過話。
Whatever it is, I need this computer to work.
不管是什么問題，我要求把這臺計算機修好。
It looked as if there would be an exciting race across the Channel.
看來會有一場激烈的飛越英吉利海峽的競爭。