Chemical reactions require the interaction of the reactant molecules .

化学反应需要在反应物分子的相互作用。

Oxygen is often used as reactant in chemical processes .

在化学过程中，氧气经常充当为反应物。

The influence of the reactant size and shape on combustion synthesis .

反应粉末大小及形状对自行傅播燃烧反应之影响。

Bringing the reactant molecules closer together , thereby increasing the collision frequency .

使反应物聚在一起,增加它们的撞击频率。

A two-dimensional , transient mathematical model for the mass transfer of reactant gas in the cathode gas channel of a pemfc is developed .

本文以二维之暂态数学模型，探讨质子交换膜燃料电池(pemfc)阴极流道中反应气体之质传问题。