雅思阅读真题详解：Sun&aposs fickle heart may leave us cold.

　　对于雅思阅读复习而言，雅思阅读真题详解无疑是非常关键的一个资料，为此澳际小编特收集整理了Sun's fickle heart may leave us cold的雅思阅读真题详解，分享给大家，希望对大家有所帮助，文中观点仅供参考。

　　1 There's a dimmer switch inside the sun that causes its brightness to rise and fall on timescales of around 100,000 years - exactly the same period as between ice ages on Earth. So says a physicist who has created a computer model of our star's core.

　　一物理学家宣称，太阳核心位置处存在着一个变光开关，可以调节亮度变化，周期为十万年，正好与地球冰川时期所经历时间相同。他还创造了太阳核心的一个计算机模型。

　　2 Robert Ehrlich of George Mason University in Fairfax, Virginia, modelled the fect of temperature fluctuations in the sun's interior. According to the standard view, the temperature of the sun's core is held constant by the opposing pressures of gravity and nuclear fusion. However, Ehrlich believed that slight variations should be possible.

　　来自于弗吉尼亚洲费尔法克斯的乔治梅森大学的Robert Ehrlich用模型模拟了太阳内部温度变化所带来的影响。根据标准说法，太阳内部的温度在重力以及核熔解的反作用下应该是持续不变的。但是，Ehrlich却认为轻微的温度变化还是有可能的。

　　3 He took as his starting point the work of Attila Grandpierre of the Konkoly Observatory of the Hungarian Academy of Sciences. In 2005, Grandpierre and a collaborator, Gábor ágoston, calculated that magnetic fields in the sun's core could produce small instabilities in the solar plasma. These instabilities would induce localised oscillations in temperature.

　　Ehrlich首先用Attila Grandpierre的发现引出自己的观点。Attila Grandpierre来自匈牙利科学研究院Konkoly天文台。2005年时，Grandpierre和同事Gábor ágoston通过计算得出，太阳内核中的磁场会引起太阳等离子体的不稳定运动。这些无规律的运动就会导致局部温度变化。

　　4 Ehrlich's model shows that whilst most of these oscillations cancel each other out, some reinforce one another and become long-lived temperature variations. The favoured frequencies allow the sun's core temperature to oscillate around its average temperature of 13.6 million kelvin in cycles lasting either 100,000 or 41,000 years. Ehrlich says that random interactions within the sun's magnetic field could flip the fluctuations from one cycle length to the other.

　　Ehrlich的模型表明，尽管大多数等离子振动会相互中和，但也有一些是相互加强的，这就形成了一个长时间的温度变化。这种频率变化会使太阳内核的温度围绕它的平均温度1360万开变化，变化周期为10万或4.1万年。Ehrlich还说，太阳内部磁场中这种随意的互动会轻易的使这种周期在两者之间变换。

　　5 These two timescales are instantly recognisable to anyone familiar with Earth's ice ages: for the past million years, ice ages have occurred roughly every 100,000 years. Bore that, they occurred roughly every 41,000 years.

　　任何一个熟悉地球冰川时期的人都会立刻明白这两种周期。在过去的一百万年里，大约每十万年就会出现一次冰川时代，在此之前，大约每4万一千年就会出现一次。

　　6 Most scientists believe that the ice ages are the result of subtle changes in Earth's orbit, known as the Milankovitch cycles. One such cycle describes the way Earth's orbit gradually changes shape from a circle to a slight ellipse and back again roughly every 100,000 years. The theory says this alters the amount of solar radiation that Earth receives, triggering the ice ages. However, a persistent problem with this theory has been its inability to explain why the ice ages changed frequency a million years ago.

　　大多数科学家都认为冰川世纪的出现是由于地球运行轨道的变化而引起的，这种轨道变化被称为米兰科维奇循环。该循环描述了地球沿轨道运行的方式，地球运行轨道时而圆形，时而椭圆形，而这种变化的周期为约十万年。此理论认为此种运行轨道的变化影响了地球接收到的太阳离子的变化，从而导致冰川世纪的形成。但是，该理论长期以来存在一个问题，那就是它无法解释为何一百万年前冰川世纪出现的频率发生了变化。

　　7 "In Milankovitch, there is certainly no good idea why the frequency should change from one to another," says Neil Edwards, a climatologist at the Open University in Milton Keynes, UK. Nor is the transition problem the only one the Milankovitch theory faces. Ehrlich and other critics claim that the temperature variations caused by Milankovitch cycles are simply not big enough to drive ice ages.

　　米兰科维奇循环并没有对该频率的变化做出很好的解释，Neil Edwards这样说道。他是位于Milton Keynes的英国公开大学的一位气候学家。他还说道，该理论面对的唯一问题则是过渡问题。Ehrlich和一些评论家宣称，由米兰科维奇循环引起的温度变化并不能成为造成冰川世纪的主要原因。

　　以上就是Sun's fickle heart may leave us cold的雅思阅读真题详解相关介绍，希望对大家有所帮助，最后祝大家都能考出好成绩。