16.To appreciate fully the diversity and abundance of life in the sea，it helps to think small.
(特殊结构 it helps to…做…有帮助)
要充分认识海洋生命的多样性和丰富性，从小的角度思考有帮助。
目的状语：To appreciate fully the diversity and abundance of life in the sea,
主句： it helps to think small.(这里的 it 是形式主语，没有实际意义)
1 7.Science is built with facts just as a house is built with bricks，but a collection of facts cannot be
called science any more than a pile of bricks can be called a house.
(特殊结构 not any more than 像…一样不…)
科学建立在事实上，就像房子用砖砌成一样。但收集的事实不能被叫做科学，就像一堆砖不
能被称为房子一样。
分句 1. Science is built with facts just as a house is built with bricks,
分句 2. but a collection of facts cannot be called science any more than a pile of bricks can be
called a house.
1 和 2 是并列分句 (转折关系)
18.The variation between the hemispheres corresponds 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. The variation 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