When a person grows old, his skin shrivels.
人老了，皮肤就变得干巴了。
Only when a person is healthy enough can he afford to overcome all hardships.
只有健康的人才有能力克服一切困难。
Silences may be thoughtful, or they may be empty when a person has nothing to say.
沉默可能是深思熟虑的表现，也可能是一个人无话可说时的空洞。
In an interview with the Paris Review Hughes speculated that when a person puts pen to paper, "you meet the terrible resistance of what happened your first year at it, when you couldn't write at all".
在接受《巴黎评论》的采访时，休斯推测，当一个人动笔在纸上写字时，“你会遇到你第一年所经历的严重阻力，那时你根本不会写字”。
When a person shouts, he cannot pronounce his words well.
一个人大喊大叫时就不能好好发音。
When a person is born without legs, there are plenty of things that are difficult to do.
当一个人生来就没有腿，有很多事情做起来都很困难。
When a person visits a foreign country, it is important to know how to ask for help politely.
当一个人到国外旅游时，知道如何礼貌地寻求帮助是很重要的。
Scientists say that sleepwalking may sometimes happen when a person is sick, has a fever, is not getting enough sleep, or he has much stress.
科学家表示，一个人生病、发烧、睡眠不足或压力过大时，有时会出现梦游症状。
A high tech test that can tell when a person is not telling the truth.
这是一种高科技测试，可以判断一个人是否在说谎。
In many countries, sixteen or eighteen is the age when a person becomes an adult.
在许多国家，十六或十八岁是一个人成为成年人的年龄。
A high-tech test that can tell when a person is not telling the truth sounds too good to be true.
一项高科技测试可以判断一个人是否在说谎，听起来好得令人难以置信。
When a person reaches thirty, his understanding of the real world should be closer to The Origin of Species than to Tom and Jerry.
一个人到了三十岁，对现实世界的理解，应该更接近《物种起源》而不是《猫和老鼠》。
When a person is running they are putting their body under stress.
当人们奔跑时，他们的肌体便处于紧张状态。
When a person stops breathing, oxygen levels in the blood decrease.
当人的呼吸暂停时，血液中的含氧量会降低。
When a person who has done something good is praised, he will feel happy.
当一个人做了好事之后受到赞扬，他会感到很幸福。
When a person who has done something good is praised， he will feel happy.
当一个人做了好事之后受到赞扬，他会感到很幸福。
When a person falls in love, a network of 12 regions of the brain are activated.
当一个人坠入爱河，联系大脑中12个区域的网络就被激活了。
When a person has cancer it indicates the person has multiple nutritional deficiencies.
当一个人得了癌症时，说明这个人有多重的营养缺乏。
There is a close connection between the mind and the body when a person is running.
这与奔跑时身脑的联系密切相关。
When a person is hanged, the blood will accumulate in its lower part: legs and feet.
一个人被吊死，血液自然聚积到他身体的最低部：腿或者脚。
When a person receives the email, they must detach the spreadsheet, edit it, and save it.
当一个人收到电子邮件时，他们必须分离电子表格，编辑它并将其保存。
When a person is stressed their heart rate becomes consistent and variability is minimized.
当人有压力时他们的心率变得前后一致，可变性降到了最低。
When a person is brought to an American court, he is presumed innocent until proven guilty.
当一个人被带到美国的法庭时，在证明有罪之前，会先假设他是无罪的。
The worst time to give advice about driving, I've learned, is when a person is driving.
于是我明白了，提驾驶方面的建议，最不恰当的时机就是，对方在开车时。
When a person is brought to an American court, he is presumed innocent until proven guilty.
当一个人被带到美国的法庭时，在证明有罪之前，会先假设他是无罪的。
When a person learns something new, certain synapses are strengthened relative to others.
当一个人学到新知识的时候一部分特定的突触相对地被增强了。
Brain activity can rise a lot more than this when a person simply looks at images on a screen.
当一个人仅仅看一看屏幕上的图像时，脑活力增强的幅度还要大。
This is often a type of dream called a 'lucid dream', when a person knows they are dreaming.
这一种叫做“清晰梦境”，即人们知道此时自己正在做梦。
When a person is infected with HIV, the virus slowly begins to destroy that person's immune system.
当一个人感染了HIV，病毒就慢慢的开始破坏这个人的免疫系统。
When a person is infected with HIV, the virus slowly begins to destroy that person's immune system.
当一个人感染了HIV，病毒就慢慢的开始破坏这个人的免疫系统。
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