New Words：

natural [ˈnætʃrəl] adj.自然的；天然的；天生的；本能的

Sample Sentences：

It's natural to worry about your children.
My hair soon grew back to its natural colour.
It's difficult to look natural when you're feeling nervous.
His natural mother was unable to care for him so he was raised by an aunt.

nature [ˈneɪtʃər] n.自然；本质；大自然；本性；自然界

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