可是执行这个办法的最后的一个困难在于站里没有一个人的手臂小到可以伸进这个只有2.5英寸的开孔，他们无法把油脂涂抹到轴承的四周。
The only problem was, nobody at the station had an arm small enough to actually reach in through the two-and-a-half inch opening and pack grease around the bearing.
血细胞在毛细血管和膜孔入口处所受到的阻力构成血液循环外周阻力的重要组成部分。
The resistance to the blood cells at the entrance to capillaries and membrane pores contributes considerably to the peripheral resistance in the blood circulation.
当地下条件较好时，人工挖孔桩通过合理的简化，可将其嵌岩灌注桩物理模型简化为端承桩，暂不考虑上部桩周土摩阻力。
If the geology condition is better, the physical model of man_dug pile can be regarded as end_bearing pile by reasonable simplification without considering the friction resistance of the soil.
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