We need helpers of all types, e.g., geologists and teachers.
我们需要各种类型的协助者，例如地质学者和教师。
By drilling, geologists can take measurements at various depths.
通过钻孔，地质学家可以在不同深度测量。
Isotopic analysis of shells allowed geologists to measure another glacial effect.
对贝壳的同位素分析使得地质学家可以测量另一种冰川效应。
By 1990 geologists had located the impact site itself in the Yucat region of Mexico.
到1990年，地质学家已经确定了撞击地点本身位于墨西哥尤卡特地区。
So, in recent years, some geologists have used plate tectonic theory to make what they call geopredictions.
因此，近年来，一些地质学家会利用板块构造理论来进行他们所谓的地质预测。
Some geologists believe that the Americas will continue to move westward and eventually merge with East Asia.
一些地质学家认为，美洲将继续向西移动，最终与东亚合并。
To most geologists today, Wegener's The origin of Continents and Oceans appears an impressive and prescient document.
对今天的大多数地质学家来说，韦格纳的《大陆和海洋的起源》是一份令人印象深刻的有先见之明的文件。
Now, we geologists thought we had a pretty good idea of how the Grand Canyon in the southwestern United States was formed.
现在，我们地质学家自认为对美国西南部大峡谷的形成有了很好的认识。
As geologists, we examine layers of sediment on the Earth' s surface to approximate the dates of past geologic time periods.
作为地质学家，我们研究地球表面的沉积层以估算过去地质时期的年代。
They bear a strong resemblance to river systems on Earth, and geologists think that they are dried-up beds of long-gone rivers.
它们与地球上的河流系统非常相似，地质学家认为它们是早已消失的河流留下的干涸的河床。
Two geologists discovered that about half of the sand from the Grand Canyon was actually once part of the Appalachian Mountains.
两位地质学家发现，约半数的来自大峡谷的沙子实际上曾经是阿巴拉契亚山脉的一部分。
Some geologists wondered whether the absence of friction-generated heat could be explained by the kinds of rock composing the fault.
一些地质学家想知道，是否可以用构成断层的岩石来解释没有摩擦产生的热量。
Most geologists and many historians today believe that Wegener's theory was rejected because of its lack of an adequate mechanical basis.
今天，大多数地质学家和历史学家认为，魏格纳的理论之所以遭到拒绝，是因为它缺乏足够的力学基础。
Even though in error, Joly's calculations clearly supported those geologists who insisted on an age for Earth far in excess of a few million years.
尽管乔利的计算有误，但其计算显然支持了那些坚持认为地球的年龄远远超过几百万年的地质学家。
Working with local geologists and engineers, the experts have studied the nature of the ground and the type of most practical building code for the local area.
通过与当地地质学家和工程师合作，专家们研究了当地土地的性质和最实用的建筑规范类型。
Prior to 1960, geologists Bowen and Hess disagreed over whether or not the very high temperatures needed to produce magmas rich in magnesium could have existed on Earth.
在1960年之前，地质学家鲍温和赫斯在地球上是否存在产生富含镁的岩浆所需的高温这一问题上存在分歧。
The oceanic volcanic islands and their hot-spot trails are thus especially useful for geologists because they record the past locations of the plate over a fixed source.
海洋火山岛和它们的热点轨迹对于地质学家尤其有用，因为它们记录了过去的板块在固定地点之上的位置。
This idea was modified in the late twentieth century, when geologists and oceanographers examining oceanic sediment found fossil evidence of warming and cooling of the oceans.
在20世纪后期，地质学家和海洋学家在研究海洋沉积物时发现了能够证明海洋变暖和变冷的化石，并修正了这一观点。
As geologists mapped glacial deposits in the late nineteenth century, they became aware that there were several layers of drift, the lower ones corresponding to earlier ice ages.
19世纪晚期，在地质学家对这些冰川沉积进行定位的时候，他们意识到有好几个漂流层，位置较低的对应的是更早的冰川期。
Eventually, Agassiz and others convinced geologists and the general public that a great continental glaciation had extended the polar ice caps far into regions that now enjoy temperate climates.
最后，阿加西和其他人说服了地质学家和普通大众，一个巨大的大陆冰川作用已经把极地冰帽延伸到了现在享受温带气候的地区。
In the mid-1990s, geologists began to notice an interesting thing.
上世纪九十年代中期，地质学家开始注意到一个有趣的现象。
So there live hard workers, geologists, two cooks, and even more mosquitoes.
这里居住了许多辛苦的工人、地质学家、两个厨师以及特别多的蚊子。
Its existence depends entirely on what geologists call the mid-Atlantic ridge.
它的存在完全取决于地质学家所称的中大西洋海脊。
But in the grand scheme of things, geologists say this is just Mother Nature as usual.
但是，地质学家们说，从事物的宏观角度来看，这只是大自然的正常现象。
But geologists caution that while the threat is real, it is impossible to say when the volcano might collapse.
然而地质学家警告说，尽管这一威胁确有其事，但是根本无法断定火山何时崩塌。
The layers of mud and microbes help geologists understand forces at work on the ocean bottom deep in the past.
泥层以及其中的微生物可以帮助地质学家了解深海海床之前所经历的外力作用。
Scattered around the globe are more than 100 small regions of isolated volcanic activity known to geologists as hot spots.
地球上散落分布着100多个互不相连的小火山活跃区，地质学家称之为热点。
Now, this once-worrisome gap in the fossil record is a period of intense interest to geologists as well as paleontologists.
这个曾经令人头疼的化石空白期现在成为了地质学家和古生物学家共同的关注对象。
At present, the majority of the geologists guess that within ten years the production of the Rand mines will be cut in half.
目前，据大部分地质学家预测，在未来十年内，兰特金矿的产量将减少一半。
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