Economic prosperity depends critically on an open world trading system.
经济繁荣关键取决于一个开放的世界贸易体系。
It began as a military communication system, which expanded into a government-funded civilian research network.
最初它是一个军事通信系统，后来扩展为一个政府资助的民用研究网络。
Britain has a well-respected higher education system and some of the top universities and research institutions in the world.
英国的高等教育体系备受推崇，拥有一些世界一流的大学和研究机构。
His writing and speaking raised the awareness of the importance of conservation and helped bring about our national park system.
他的写作和演讲提高了人们对保护自然的重要性的认识，并帮助建立了我们的国家公园系统。
Optimism's benefits for physical health also extend beyond heart health, such as improved immune system function and increased life span.
乐观对身体健康的益处不仅限于心脏健康，还包括改善免疫系统功能和延长寿命。
Many doctors and researchers believe that loneliness harms the immune system, making us more vulnerable to a range of minor and major illnesses.
许多医生和研究人员认为，孤独会损害免疫系统，使我们更容易患上一系列轻微和重大疾病。
He believes that as far back as 30,000 B.C., hunters may have used a system of notation, engraved on bone and stone, to mark phases of the Moon.
他认为，远在公元前30,000年以前，猎人可能会用一套刻在骨头和石头上的符号系统来标记月相。
Not only did they develop such a device but by the turn of the millennium they had also managed to embed it in a worldwide system accessed by billions of people every day.
他们不仅开发了这样一种设备，而且在世纪之交，他们还成功地将其嵌入到每天有数十亿人访问的全球系统中。
New electric engines coupled with artificial intelligence and autonomous systems will contribute to a more efficient, integrated transport system that is less polluting and less noisy.
新型电动引擎与人工智能和自主系统相结合，将有助于建立一个更高效、污染更少、噪音更少的综合运输系统。
Children and teens with a cold or flu should not take aspirin for pain relief because of the risk of Reye syndrome, a rare but serious condition of the liver and central nervous system.
患有感冒或流感的儿童和青少年不应该服用阿司匹林来缓解疼痛，因为这会有雷氏综合症的风险，雷氏综合症是一种罕见但严重的肝脏和中枢神经系统疾病。
For more than 300 years, we thought Saturn was the only body in the solar system with rings.
在300多年的时间里，我们一直认为土星是太阳系唯一拥有光环的天体。
Of course, we now know that the planets, including Earth, revolve around the Sun, and that the solar system is only a tiny part of the universe.
当然，我们现在知道，包括地球在内的行星都围绕太阳公转，而太阳系只是宇宙的一小部分。
The surface of Mars shows a wide range of geologic features, including huge volcanoes—the largest known in the solar system—and extensive impact cratering.
火星表面显示出广泛的地质特征，包括巨大的火山——太阳系中已知的最大的火山——和广阔的撞击坑。
Beidou is China's first global navigation satellite system.
北斗卫星导航系统是中国第一个全球卫星导航系统。
More than 120 countries and regions are using the Beidou system.
超过120个国家和地区正在使用北斗系统。
He has set up the world's first ocean cleanup system with his team.
他和他的团队建立了世界上第一个海洋清理系统。
Scientists have launched many spaceships to explore other planets in the solar system.
科学家们已经发射了很多宇宙飞船去探索太阳系的其他行星。
Most surprisingly of all, plants have an amazing system of communication that can link nearly every plant in a forest.
最令人惊讶的是，植物具有一个惊人的交流系统，可以把森林里的几乎每一株植物连接起来。
The world's food system is responsible for about one quarter of the planet-warming greenhouse gases that humans produce each year.
人类每年产生的温室气体中，约有四分之一是由世界的食物系统产生的。
An estimated 99.85 percent of the mass of our solar system is contained within the Sun, while the planets collectively make up most of the remaining 0.15 percent.
太阳占据了太阳系总质量的大约99.85%，而在剩余的0.15%中，行星占据了大部分。
The inspiration for the garment is the bat's echolocation system.
这件衣服的设计灵感源自蝙蝠的回声定位系统。
Laughing lowers levels of stress hormones and strengthens the immune system.
笑可降低应激激素水平，并加强免疫系统。
As a pediatrician, I know fever is a signal that the immune system is working well.
作为一名儿科医师，我知道发烧是身体免疫系统运行良好的一个信号。
1809 - Louis Braille, inventor of a reading system for the blind, was born in France.
1809年的今天，盲文系统的发明者路易·布莱尔在法国出生。
The system is just nine light years away, a mere stone's throw in astronomical terms.
这个系统与我们只有9光年的距离，在天文学范畴内就是咫尺之遥。
Indeed, something similar may have happened in a solar system just 50 light-years away.
的确，就在50光年之外的一个恒星系统中，可能发生过类似的情况。
Laughing increases positive endorphins, reduces stress and strengthens the immune system.
大笑可以提高内啡肽水平、减少压力、强化免疫系统。
The sun lies at the heart of the solar system, where it is by far the largest object.
太阳位于太阳系的中心，也是太阳系中最大的天体。
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