Allenes
二烯烃
🗣️ 情景例句
And guess what?
你们猜怎么着？
Love makes obedience easy.
爱情使服从变为易事。
when H.M.S. Porcupine was put at the disposal of the Royal Society for several cruises,
皇家学会用英国"豪猪号舰艇进行了几次巡航后，