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....
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...