12. Wait 30 Minutes!

A: It's so hot! Let's go swimming now!

B: We have to wait a while before swimming.

A: But why? The sun is so hot!

B: It's bad to swim after you just ate.

A: Why? Will you sink in the water?

B: No. The motion and sudden cold will make you sick.

A: What kind of sick?

B: It can make you nauseated, and you might throw up.

A: How long do we have to wait?

B: Only about half an hour.

A: Half an hour?! I'll bake in the sun!

B: It's better than throwing up your lunch!