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self diffusion velocity 自扩散速度
Although water molecules may pass through the cell membranes in a simple penetrative diffusion mode, this diffusion velocity is very slow. 水分子虽然可以以简单渗透扩散方式通过细胞膜，但是扩散速度非常缓慢。
On the basis of Fick diffusion law, a method of determining diffusion velocity of HCl and FeCl 2 in the anion exchange membrane was offered in this study. 本文依据Fick扩散定律提出了测定HCl和FeCl2在阴离子交换膜中扩散速度的方法。
The root cause of data remanence of SRAM is determined which is the decrease of excess-carrier recombination rate and carrier diffusion velocity at low temperature. 确定了低温下非平衡载流子复合率及扩散速度的降低，是导致SRAM断电后数据残留的主要原因。
This paper analyzes the different properties of active GaAs/Ge SC from those of inactive GaAs/Ge SC,explains active GaAs/Ge solar cell's formation mechanism:gallium's self diffusion produces a p?type layer in n?type Ge wafer. 分析了活性和非活性GaAs/Ge太阳电池不同特性，活性电池形成的机理是由于Ga的自扩散，在n型Ge中形成了一个p型层。
Through analyzing the factors of influencing the ability of mudstone caprock stopping gasdiffusion, we think that the diffusion velocity is an important parameter for evaluating the ability. 通过对影响泥质岩盖层阻止天然气扩散能力因素的分析，认为扩散速度是评价泥质岩盖层自身阻止天然气扩散能力的重要参数。
The process of leach ing depends on the seeping and diffusing velocity of leaching agent and resultant. 氧化铜矿石的浸出过程主要受浸出剂与溶出物在矿石中的渗流与扩散速度的影响。
I do not like to go to the movies by my self. 我不喜欢自己一个人看电影。
I my self is going to make a sandwich. 我要亲手做个三明治。
He was a wreck of his former self. 他身体坏得不成样子，已兴从前判若两人。
Knowledge of self increases as one gets older. 随着年岁的增长，人们的自我认识也不断加深。
Gazelles can move with astonishing velocity. 羚羊跑起来速度惊人。
He's not looking like his old self lately. 他最近看起来不像以前那样。
Lashing velocity of pump is concerned with nature of air. 泵的抽气速率与气体的性质有关。
Clouds cause the diffusion of light from the sun. 云使阳光漫射。
He is my best friend, my second self, as it were. 他是我最好的朋友，或者说，是第二个我。
The car was moving at such a velocity! 那辆汽车的速度简直太快了！
He never has any thought of self. 他从不考虑个人得失。
He is now out of all conceit with his former self. 他现在全盘否定了他原来的自己。
Gazelles can movewith astonishing velocity. 羚羊跑起来有时速度惊人。