• 1. diffusion outward: 向外扩散
• 2. outward diffusion: 向外扩散

• 1.The particle transport consists of outward diffusion and inward convection.
  粒子输运由向外扩散和向内对流构成。
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• 2.It is placed inside sealed container to suck volatile liquid, such as mosquito repellent liquid, perfume and freshener, slowly for outward diffusion.
  主要用于将放置在密封容器内易挥发的液体缓慢抽吸并扩散到外面空间，特别适合驱蚊液、香水、清新剂的慢扩散之用。
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