如果你的脚踝是呆板的，你不能点脚和脚趾离开身体，用游泳脚蹼更多。
If your ankles are inflexible and you can't point the feet and toes away from the body, use swimming fins more often.
所以为什么我们不允许，所有人在游泳时戴上脚蹼呢？
So why don't we just allow everyone to have flippers when they're swimming?
它们可是游泳的高手，那双像船桨似的前爪呈轻微的脚蹼状。
They are very strong swimmers, and their large front PAWS, which they use to paddle, are slightly webbed.
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