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When a new moss is found it must be compared with all other mosses to make sure that it hasn't been recorded already. 要是发现了一种新的苔藓,就要把它和所有别的苔藓进行比较,看看是不是已经有过记录。 Then a form
One of the oddities of our solar system is that the Sun burns about 25 percent more brightly now than when the solar system was young. 现在太阳燃烧的旺度,要比太阳系形成之初强了大约25%,这是我们太阳系的怪事之一。
In the 1830s, the British naturalist Edward Forbes surveyed ocean beds throughout the Atlantic and Mediterranean 19世纪30年代,英国博物学家爱德华福布斯勘察了大西佯和地中海各处的海床, and declared that there was no li
They also discovered, by means of depth measurements, that there appeared to be submerged mountains in the mid-Atlantic, 通过测量深度,他们还发现大西洋中部的水底下似乎有山脉。 prompting some excited observers to speculate t
At 3,000 feet, their little porthole was subjected to nineteen tons of pressure per square inch. 到了900米,小舷窗受到的压力高达每平方厘米2.95吨。 Death at such a depth would have been instantaneous, as Beebe never failed to obse
In The Other Side of Everest, the British mountaineer and filmmaker Matt Dickinson records how Howard Somervell, 在《珠穆朗玛峰的另一侧》中,英国登山家兼电影制片人马特迪金森记录下了霍华德萨默维尔的情况。 o
The standard way to envision this is to imagine yourself at the center of a large carousel and tossing a ball to someone positioned on the edge. By the time the ball gets to the perimeter, the target person has moved on and the ball passes behind him
Even so, spaceships have to take care in the outer atmosphere, particularly on return trips to Earth, 即使这样,宇宙飞船在外层大气也不得不小心翼翼,尤其是在重返地球的过程中。 as the space shuttle Columbia demonstra
From ground level to its highest point, the troposphere (or turning sphere) 从地面到最高点,对流层(亦称对流圈) is about ten miles thick at the equator and no more than six or seven miles high in the temperate latitudes where most
17 Into the Troposphere 第十七章 进入对流层 Thank goodness for the atmosphere. It keeps us warm. 谢天谢地,我们有了大气。它使我们有了个温暖的环境。 Without it, Earth would be a lifeless ball of ice with an average te
In terms of adaptability, humans are pretty amazingly useless. 就适应能力而言,我们人类是很没有本事的。 Like most animals, we don't much like really hot places, but because we sweat so freely and easily stroke, we are especially v
It has been suggested, not altogether cynically, that this was out of a purely contrarian instinct, 有人认为。而且不完全是挖苦地认为,这纯粹是出于一种敌对的本能。 and that if he had been born in the Soviet Union he woul
If the pressure is changed too rapidlyas with a too-quick ascent by a diver, 要是压力变化太大比如潜水员上升太快, the bubbles trapped within the body will begin to fizz in exactly the manner of a freshly opened bottle of champagne, 体
In the days of diving suitsthe sort that were connected to the surface by long hoses, 在使用潜水衣即用长管子连接水面的那种装备的年代, divers sometimes experienced a dreaded phenomenon known as the squeeze. 潜水员有时候会
It's a kind of genetic photocopying, and it became the basis for all subsequent genetic science, from academic studies to police forensic work. 这一种复制基因的方法后来成了遗传科学的基础,无论是对于学术研究,还是对于
However, when at length they emerged into the fresh air of a London evening, 然而,当他们最后走进伦敦夜晚的新鲜空气里的时候, the bubbles sprang instantly to fizziness, memorably enlivening the digestive process. 气泡立刻泛
And in between there's everything you could possibly imagine. 介于二者之间的东西应有尽有,只要你想得出来。 I've never been any place where geology is more evidentor prettier. 我从来没有见过哪个地方,地质情况是如此
All this was hypothetically interesting until 1973, when an odd occurrence made it suddenly momentous: 这一切都很有意思,但都是假设的。直到1973年,一件怪事发生了,突然之间那个假设变得很有意义: water in Yell
So all that can be said is that at some slightly indeterminate point as we head toward the center of Earth we leave the asthenosphere and plunge into pure mantle. 因此,我们只能说,在前往地球中心的过程中,我们会在某个不大确
The hour hand on a clock moves about ten thousand times faster than the flowing rocks of the mantle. 钟面上时针的移动速度,比地幔岩石的流动速度,要快大约1万倍。 The movements occur not just laterally as the Earth's plates