To protect your hair, you should coat it with a protective spray.

为了保护头发，你应该喷上防护喷雾。

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You should put four coats of paint on wood to protect it.

你应该在木料上涂四层漆加以保护。

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You should put four coats of paint on wood to protect it.

你应该在木料上涂四层漆加以保护。

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