1·At the height of 8,000 meters, there is only 30% O₂ and the human body can only stand this height for a few days, so it is dangerous for humans to climb higher.
在8000米的高度，只有30%的氧气，人体只能处于这个高度仅几天，所以人类再往上爬是危险的。
2·They are produced by the human body.
它们是由人体产生的。
3·Water is important to the human body.
水对人体很重要。
4·How low gravity affects the human body.
低重力如何影响人体。
5·The human body needs such a balance, too.
人体也需要这样的平衡。
6·Doctors study the structure of the human body.
医生研究人体构造。
7·In biology this week, the topic is Human Body.
本周生物学的主题是人体。
8·The human body is a machine that can raise lots of interesting questions.
人体是一台能提出许多有趣问题的机器。
9·Scientists have obtained more evidence that plastic is finding its way into the human body.
科学家们已经获得了更多的证据来证明塑料正在进入人体内。
10·Thousands or even millions of tiny machines can be sent into the human body with specific tasks.
成千上万甚至上百万的微型机器可被送入人体执行特定的任务。