Semibenzene
半苯, 對二烷基亞甲基環己二烯
??? 情景例句
He's on leave now.
他現在在休假。
What were you doing at about 4 o'clock yesterday afternoon?
你昨天下午在大約4點鐘正在做什么？
The doctor advised me to give up smoking.
醫生建議我戒煙。