For years he was a boffo box office certainty.多年来,他一直是票房收入的保证.There is too little certainty about the present state of the German economy.德国当前的经济非常不稳定。It is impossible to say with certainty what Ichthyostega was doing as...
Fluorin can avoid brown striation and whiten skins.氟:能消除褐色斑,使皮肤变白.The free fluorin content in liquid multi - vitamin was quantitatively analyzed by using a simple potentiometric titration.使用简单的电位滴定法定量分析维生素中游离氟的含量.It is c...