Why does diffusion appear to be slow?

Why does diffusion appear to be slow? why does a cake like playing baseball why does a rich man want a wife What skills and knowledge does a good manager need?why? why does acook wear a high,white hat? Why does a lot of people lose their life why does lisa have only a few friends?的意思 why does you do it?这句话对a吗? Why does Jim get a certificate是神马意思 oh!why does a bad mood 翻译成中文 diffusion register 英语脑筋急转弯答案：how many sides does a house have why does time fly? Why does he going to Disneyland next week.改错A does.B going.C next week. why does a man 's hair become grey beforehis beard does Why does he like pandas单选Why does he like pandas?Because they are---A smartB intelligentC a bit shyD very cute 英语翻译analysis of a parabolic cross-diffusion semiconductor model with electron-hole scattering diffusion是什么diffusion是什么 怎样separate mixtures? why does she like math?