New Words：

sour [ˈsaʊər] adj. 酸的;有酸味的
yell [jel] v. 叫喊;大喊;吼叫

Sample Sentences：

These kinds of apples are sour.
I don't like grapes, they're sour.

Please don't yell at me.
I'm sorry I yelled at you last night.

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