美国有线新闻 CNN 朱诺号探测器进一步解密木星 美国即将进入夏令时

 

AZUZ: Compared to earth's mass, Jupiter is thought to be much larger than that. And scientists say NASA's Juno spacecraft has led to new findings about Jupiter.

For one thing, they believe the planet's surface has bands of gas and winds that flow very quickly in opposite directions. They don't know how deeply these bands extend, though, but information from Juno has led them to conclude that Jupiter's outer layer extends 1,900 miles beneath the surface of the planet.

So, how did they come up with this? Juno took measurements of Jupiter's gravitational field, which scientists use to more deeply analyze¹ the planet. They also concluded that though Jupiter's interior is thought to be fluid, it rotates like a solid body.

The Juno mission cost the U.S. a little over $1.1 billion. It's hoped to help scientist better understand the solar system's largest planet.

Jupiter is located fifth in line from the sun. Both Jupiter and the Juno's spacecraft were named after characters in Roman mythology².

Back down to earth now, the United States is gearing up for a time change that said to give Americans more light in the evening. Actually, the light itself won't change but the time on the clock when it's still light outside well.

Daylight Savings³ Time begins when clocks are moved forward one hour. The exact technical time when this is supposed to happen is at 2:00 on Sunday morning when it will instantly become 3:00. It could mean one fewer hour of sleep unless we go to bed early, and it could make us late for everything on Sunday if our clocks aren't set.

There are historic reasons for springing forward.

JENNIFER GRAY, AMS METEOROLOGIST: So why do we change the clocks ahead one hour in the spring and back one hour in the fall?

Well, it's actually to reduce the electricity consumption by extending the daylight hours.

SUBTITLE⁴: Why do we change our clocks?

GRAY: In the U.S., we change our clocks at 2:00 a.m. on the second Sunday in March. That begins Daylight Saving Time, that's when we spring ahead.

On the first Sunday in November, we change our clock at 2:00 a.m. again, that's actually just going back to Standard Time.

Believe it or not, this started with an idea from Benjamin Franklin. Franklin did write an essay suggesting that people could use less candles if they got up early and made better use of daylight.

In 1918, the Standard Time Act established time zones, and Daylight Saving Time. But not all states participate. To this day, most of Arizona and all of Hawaii do not change their clocks.

Over 70 countries across the world observe Daylight Saving Time, with notable exceptions of China and Japan.

In 2007, we actually change the date of when we set our clocks back an hour to the first week in November. This helped protect trick-or-treaters by giving them an extra hour of daylight.

One of the other lines of thinking was that we would have a better voter turnout on election years.

Experts say each time you change your clocks, it's always a good idea to change those batteries in your smoke detector⁵ and always look forward to fall when you get that extra hour of sleep.

1 analyze   

vt.分析，解析 (=analyse)

参考例句：

• We should analyze the cause and effect of this event.我们应该分析这场事变的因果。
• The teacher tried to analyze the cause of our failure.老师设法分析我们失败的原因。

2 mythology   

n.神话，神话学，神话集

参考例句：

• In Greek mythology,Zeus was the ruler of Gods and men.在希腊神话中，宙斯是众神和人类的统治者。
• He is the hero of Greek mythology.他是希腊民间传说中的英雄。

3 savings   

n.存款，储蓄

参考例句：

• I can't afford the vacation,for it would eat up my savings.我度不起假，那样会把我的积蓄用光的。
• By this time he had used up all his savings.到这时，他的存款已全部用完。

4 subtitle   

n.副题（书本中的），说明对白的字幕

参考例句：

• His new book has a subtitle.他的新书有一个副标题。
• Ah!I don't know why they don't subtitle these movies.唉！我不知道这些电影为什么不打字幕。

5 detector   

n.发觉者，探测器

参考例句：

• The detector is housed in a streamlined cylindrical container.探测器安装在流线型圆柱形容器内。
• Please walk through the metal detector.请走过金属检测器。