76. It was because he was in a very watery environment, safe fi.om the bacteria that need oxygen to live.

　　77. His hands and fingernails suggested that he hadn't done heavy manual work in his life—he could have been a rich man.

　　78. After spending a few minutes on a crowded city street, the brain is less able to hold things in memory, and suffers from reduced self-control.

　　79. The good news is that even slight alterations, such as planting more trees in the inner city or creating urban parks with a greater variety of plants, can significantly reduce the negative side effects of city life.

　　80. Previous studies have shown the longer the mom breastfeeds, the more benefit for her body.

　　英译中

　　76.这是因为他处于一个潮湿的环境中，不会受到细菌的伤害，这些细菌需要氧气才能生存。

　　77.他的手和手指表明他一生中没有做过繁重的手工劳动--- 他可能曾经是一个有钱人。

　　78.在拥挤的街道上呆了几分钟之后，大脑会变得不太能记住东西，自我控制能力也会减少。

　　79.好消息是即使小小的改变都能减少城市生活所带来的消极影响，例如可以在市中心种更多的树，或是栽种各种各样的植物来创造城市花园。

　　80.先前的研究表明母乳喂养的时间越长，母亲的身体就会越受益。