Not only convection but also random diffusion of substantial particle and their sediment are considered in the model.
该模型不仅考虑了质点在海水中的对流运动，而且还用大量质点的随机扩散模拟湍扩散过程。
Shrinkage can be large, due to both the fine particle size of the powders and the substantial proportion of polymer binder used.
由于所用粉末细小微粒的尺寸和聚合物粘合剂的真实比例，收缩可以比较大。
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