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...
One secret he learned very early on was not to flaunt his success.他很早就学到的一个秘诀就是不要夸耀自己的成功。Why would you flaunt that on a public forum?为什么你们会在公共论坛大肆炫耀?Flaunt your age and you must not have much longer to live.卖老要活不长的.Don’t...