曲面

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()()(de )(biān )(yuán )(huò )(kōng )(jiān )(zhōng )(de )()线(xiàn )()()(dìng )(tiáo )(jiàn )(yùn )(dòng )(de )(guǐ )()()()(qiú )(miàn )(yuán )(zhù )(miàn )(děng )

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