The protector keeps other people at a distance either by not engaging in contact or by pushing them away.
保护者与他人保持距离，要么避免接触要么推开他们。
Maximum efficiency in water is achieved by pushing a large amount of water a short distance rather than by pushing a small amount of water a large distance.
更好的流体推进效率的获得是通过推动大量的水(哪怕是推动的行程短一些)，而那种推动虽然比较长，但推动的水量比较少的方式获得推进效率则比较小。
Maximum efficiency in water is achieved by pushing a large amount of water a short distance rather than by pushing a small amount of water a large distance.
更好的流体推进效率的获得是通过推动大量的水(哪怕是推动的行程短一些)，而那种推动虽然比较长，但推动的水量比较少的方式获得推进效率则比较小。
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