“Their powerful flippers propel them through the water in search of prey.”

You're reading a website about penguins. It's written in a kind of scientific style. One part of the page is about how they swim. It says:

Their powerful flippers propel them through the water in search of prey.

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“Now — paddle your arms and kick your legs!”

You're teaching your daughter to swim. You're holding her in the water, and now you want her to move her arms and legs. You say:

Now — paddle your arms and kick your legs!

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