Allene is an isomer of methyl acetylene.丙二烯是甲基乙炔的一种异构体.In the darkness, the machine gun spat a vindictive white light like an acetylene torch.机枪在黑暗中吐出一道凶厉的白光,活象一支喷火的乙炔吹管.In the high - pressure system both oxygen and acet...
蝉是要蜕皮的.A cicada throws its slough.只有到蝉鸣图书馆里你才能找到答案.You will find that answer only in the library of the cicadas.蝉儿唱出炎热季节的欢歌.The locust shrills his song of heat....