影响化学反应速率的因素分为内外因：内因：反应物本身的性质；外界因素：温度，浓度，压强，催化剂，光，激光，反应物颗粒大小，反应物之间的接触面积和反应物状态。另外，x射线，γ射线，固体物质的表面积与反应物的接触面积，反应物的浓度也会影响化学反应速率。
第三章主要分析和论述了北约转型的内因与外因。
The third chapter mainly analyzed and discussed the internal and external causes of NATO's transformation.
相比之下，当前中东和平进程停滞不前，主要是因为缺乏上述内因与外因的双重条件。
Nevertheless, the current Middle-East peace process is still in stagnation, mainly due to the lack of both internal and external dynamics above-mentioned.
其次讲究方法，乡风文明建设应兼顾普遍性和特殊性、前进性和曲折性、内因与外因、短期利益与长远利益；
The second step is to choose the best method which combined universality and specialization, progress and complication, internal and external cause, short-term and long-term interests together.
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