观鸟的时候一定要保持安静._________________you keep quiet while watching the birds.

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观鸟的时候一定要保持安静._________________youkeepquietwhilewatchingthebirds.观鸟的时候一定要保持安静._________________youkee

观鸟的时候一定要保持安静._________________you keep quiet while watching the birds.
观鸟的时候一定要保持安静._________________you keep quiet while watching the birds.

观鸟的时候一定要保持安静._________________you keep quiet while watching the birds.
Make sure