Red blood cell with a biconcave disc shape is to provide a large surface area to volume ratio to facilitate the diffusionofgases.
红血球的双凹面圆盘形可以增加它的表面积，以利气体的扩散。
2
By computing and analytically comparing with formulations developed by other investigators, the bulk diffusion mechanism of reacting gases and chars has been further revealed.
通过计算和与其它研究者开发的计算公式进行比较，进一步揭示了反应气体和炭的容积扩散本质。
3
The results show that oxidizing mechanism of the heater tube is mainly diffusionof metal ion passing through oxide and its reaction at the oxide-gases boundary.