这大幅增加了球的阻力，使它减速更甚。
This substantially increased the drag on the ball, which made it slow down even more.
减速使新介质获得不同的折射率。
The deceleration gives the new medium a different refractive index.
它们可以滑过使它们减速的涡流，然后通过“推开”涡流获得额外的推力。
They can glide past eddies that would slow them down and then gain extra thrust by "pushing off" the eddies.
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