1·Distinguish above all so bacterium of cause of disease is bacterium of positive of change orchid family name or electronegative bacterium choosing antibiotic respect meaning great.
所以首先区分病原菌是革兰氏阳性菌还是阴性菌，在选择抗生素方面意义重大。
2·RH electronegative blood, who can explain?
RH 阴性血，谁能解释一下？
1·Some people like to use an arrow, and the arrow points in the direction of the more electronegative end.
也可以用箭头，箭头指向,带负电的一极。
1·Which of those two is more electronegative? The oxygen.
它们两个中哪个有更高的电负性？氧。