甲烷和丙烷是烷烃。Methane and propane are alkanes.某碳氢化合物已知可能是烯烃或是烷烃.A hydrocarbon was known to be either an alkene or alkane.直链烷烃使机器的 “ 爆震 ” 问题更加严重.The straight - chain alkanes exacerbate the problem of engine " knock "....
One tooth works while the other one idles and gets no stimulation in its root area.一颗牙齿在工作,另一颗则闲着,它的牙根部得不到刺激.In addition , immune stimulation can induce lipolysis of fat depot around lymph node.免疫刺激还会作用于淋巴结周围的脂肪组织,引起这些脂肪...