external diffusion的用法和樣例：
例句
- The experiment data proved that this kind of reaction was kinetically controlled and the internal diffusion limitation can be neglected.
提出了攪拌釜中克服外擴散的方法和條件，實驗證明了反應過程為動力學控制，內擴散影響可以忽略。 - 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.
然後沿著交通線逐步向外擴散，在有利的地點形成新的生長點。
