非解离型部分通常为脂溶性，很容易透过细胞膜扩散。
The un-ionized form is usually lipid soluble and diffuses readily across cell membranes.
当这种弱酸性药物经口服给药时，胃与血浆之间的非解离型药物浓度梯度很大，从而有利于透过胃粘膜扩散。
When the weak acid is given orally, the concentration gradient for un-ionized drug between stomach and plasma tends to be large, favoring diffusion through the gastric mucosa.
本文根据天然气发动机混合气的形成特点，把天然气发动机分为预混合燃烧型和非均质扩散燃烧型，并分析了这两种天然气发动机的技术特点、燃烧特点与排放等性能。
According to the features of the mixture formation in natural gas engine, natural gas engine can be classified as two types: premixed combustion type and heterogeneous diffusive combustion type.
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