(the reaction takes place with water molecules, and the oxygen comes from the water; the rest of the water molecule becomes a pair of hydrogen atoms, which is also useful).
这个反应是需要水分子的,且氧原子是来自水分子;其余的水分子变成仍有用的一对氧原子。
Questioner: I understand what you say but again the speed of association is so instantaneous that the reaction takes place before one realizes it.
提问者:我明白你说的话,但是联结的速度太快了,我们还没来得及意识到,反应就发生了。
The reaction takes place only in the presence of a catalyst .
只有在催化剂的作用下,反应才会发生。
The explosive reaction takes place in two stages.
爆炸反应分两个阶段。
The condensation reaction takes place between the two hydroxyl of phthalic acid, and the phthalic acid be converted into phthalic anhydride finally.
邻苯二甲酸的两个羧基上的羟基会发生缩水反应,最终生成邻苯二甲酸酐。