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18.The variation between the hemispherescorresponds to which side of the body is used to perform specific activities．
(从句which side…is used…作corresponds to的宾语
两个半球之间的不同与身体的哪一部分用于进行特定的活动是对应的。
分句1: Thevariation between the hemispheres corresponds to
分句2: which side of the body is used to perform specific activities．
1和2是嵌套
1是主句，2做主句的宾语
