采用符合填料，密封可靠，摩擦力小。
哦对了不要忘了你还需要一个小脚轮(必须是摩擦力小的)。
Oh and don't forget a castor (something low friction that drags).
本阀门结构为法兰连接，具有开启行程小、摩擦力小、耐磨等特点。
Flanged valves have following features: small opening stroke, small friction force when opening and shutting, and high abrasion resistance.
绿色的木块比褐色的木块有弹性，而且摩擦力小，并且他们都可以被移走。
The green ones are both bouncier than the brown ones, and have less friction, and they too can be destroyed.
无粘结预应力筋摩擦力小，且易弯曲成各种形状，特别适合建造需用复杂的连续曲线配筋的大跨度楼盖和屋盖。
The tendons of unbounded PPC have smaller fraction force and are easier to bend to many shapes , so it is more suited for building these rooms whose span are large.
它们的腿有点弯曲，脚尖上有小钩，提供足够的摩擦力，使它们能在湿滑的环境中活动。
The legs, which are slightly curved with tiny hooks on the tips of their feet to provide enough friction to enable movement in a slippery environment.
实验测定表明，正常动物关节内关节软骨之间的摩擦力是非常小的，其摩擦系数大约为0.002～0.02的范围。
The experimental tests show that the friction between cartilages in normal animal joints is very low and its coefficient of friction is in the range 0.002 to 0.02.
之后驱动臂通过弹簧拉动返回初始位置，此时驱动臂下面的小轮是滚动返回的，不产生相反的摩擦力。
The process is just like rowing a boat. And then, the driving arm return to the primary position by the pulling from the spring.
由于空腹轨道内空间小，驱动轮安装在空腹轨道外部，靠弹簧力产生的摩擦力带动小车运行。
Because the inner space of a hollow track is small, a driving wheel is arranged outside the hollow track in the prior art, and a dolly is driven to move by friction force generated by spring force.
由于空腹轨道内空间小，驱动轮安装在空腹轨道外部，靠弹簧力产生的摩擦力带动小车运行。
Because the inner space of a hollow track is small, a driving wheel is arranged outside the hollow track in the prior art, and a dolly is driven to move by friction force generated by spring force.
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