Assume that atmosphere is made of diatom ideal gas in adiabatic equilibrium.大气可看成绝热平衡下的双原子理想气体.The food composition consisted of eight groups: diatom, protozoa, spongiaria, annelida, mollusca, crustacea, echinodermata an...
...an old toothbrush.一把旧牙刷The toothbrush gently removes plaque without damaging the gums.这种牙刷可以温和去除牙菌斑而不损伤齿龈。As soon as the bristles on your toothbrush begin to wear, throw it out.牙刷毛一开始磨损，就把它扔掉。He was short and tubby an...