external diffusion的用法和样例：
例句
- The experiment data proved that this kind of reaction was kinetically controlled and the internal diffusion limitation can be neglected.
提出了搅拌釜中克服外扩散的方法和条件，实验证明了反应过程为动力学控制，内扩散影响可以忽略。 - The aggregation and diffusion of indus tries and the evolution and promotion of industrial structure are important fact ors to maintain TEB and motivate its development.
然后沿着交通线逐步向外扩散，在有利的地点形成新的生长点。
