Air pumps are involved, but their role is limited to creating a partial vacuum in the pipes in order to reduce resistance to the capsules' movement.
也使用气泵，但作用仅限于在管道中制造半真空，以减小胶囊运行的阻力。
Air pumps are involved, but their role is limited to creating a partial vacuum in the pipes in order to reduce resistance to the capsules' movement.
也使用气泵，但作用仅限于在管道中制造半真空，以减小胶囊运行的阻力。
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