在管壁处液体速度近似为零，并在管中心处达到最大。
Liquid velocity is near zero at the pipe wall and increases to maximum at the pipe center.
在总管径不变的情况下，每增加一个管腔就会减少各自的口径，进而减少液体的最大输注速度。
Each additional lumen decreases the size of the individual lumens, which will decrease the maximal rate at which fluids can be administered.
在总管径不变的情况下，每增加一个管腔就会减少各自的口径，进而减少液体的最大输注速度。
Each additional lumen decreases the size of the individual lumens, which will decrease the maximal rate at which fluids can be administered.
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