陕北植被变迁在地质时期以及历史时期早期，主要由气候条件所控制，植被类型随气候的冷暖干湿变化而变迁。
During the early geological and historic stage, it was the climate that mainly influenced the change of the vegetation in the north of Shaanxi.
至少在过去的5亿年中的一部分时间内，地球上的物种的50%到90%以上已经在地质时期的一瞬间内消失了。
At least a handful of times in the last 500 million years, 50 to more than 90 percent of all species on Earth have disappeared in a geological blink of the eye.
在整个地质时期，它们随着自然地气候循环减小或涨大。
Over geologic time, they have ebbed and flowed with natural climate cycles.
劳克林说，在讨论气候变化问题时，必须对比过去地质时期的情况。
You can't discuss climate change, Prof. Laughlin says, without looking backward across geologic time.
影响地质时期的大地震虽然在人类的历史中非常罕见，但该地区地震活动自古以来就非常频繁。
Although rare on human timescales, over geologic time earthquakes are frequent in the area.
由于强烈的地质活动产生自然扫描干扰，这颗行星在它历史上绝大多数时期都躲开了探奇的目光。
The intense geological activity creates natural scanning interference that has kept prying eyes away from Mustafar for most of its history.
在目前的时间点上，气象和地质活动显著增加了，并会以非线性速下去，一直到我们进入极移前的短时期。
At the present point in time, meteorological and geological activity is significantly increasing and will do so at a non linear rate until we enter the short term period before the Pole Shift.
古地温曲线是岩石圈在特定地质时期热结构的集中体现。
Paleogeotherm is important for understanding the thermal structure of lithosphere at a specific geological time.
本文简要回顾了1950-2005年间，铁路工程地质勘察设计系统在铁路基本建设的各个时期所发生的历史事件。
This paper briefly looked back the history affairs of survey and design system of railway engineering geology, happened in each period of railway construction between 1950 and 2005 years.
遗迹相是指一组具有特征的遗迹化石组合，在一段相当长的地质时期中不断的重视以及它们的环境意义。
The ichnofacies is the grouping of characteristic trace fossil association tending to rscirrence through a rather long interval of geologic time, and their environmental implication.
硬鳞鱼在更早的地质时期数量巨大。
Ganoid fishes swarmed during the earlier geological periods.
米兰柯维奇旋回在地质历史时期具有相对的稳定性，其在地层中的记录可以作为一座精确的“沉积物钟”和辅助的测龄工具。
The Milankovitch cycle, whose records in strata can be considered both as an accurate "sediment clock" and as an auxiliary dating tool, is relatively stable in the geologic history.
银矿是在一定的地质历史时期以及特定的地质环境中，受到一些重要的地质事件影响而形成的。
Silver deposits are formed by suffering some important geological events in a certain geological history period and special geological environment.
在某些地质时期还与幔源岩浆的底垫对地壳或岩石圈的改造有关。
Some times in the process there was reworking of diapir of mantle-sourced magma on the crust or lithosphere.
人天生就具有好奇心，我们对我们居住的地球以及在整个地质时期发生的各种改变都非常感兴趣。
Humans are by nature curious, and we are all interested in the Earth on which we live and how various aspects have changed through geologic time.
临清坳陷白海西期以来各地质时期的盆地格局在垂向和横向上均存在着明显的差异，后期盆地对先期盆地进行了强烈的叠加构造。
Since Hercynian Era there have been obvious differences in vertical and horizontal basin pattern of Linqing depression, a strong superposition structure of post basin being on the earlier basins.
临清坳陷白海西期以来各地质时期的盆地格局在垂向和横向上均存在着明显的差异，后期盆地对先期盆地进行了强烈的叠加构造。
Since Hercynian Era there have been obvious differences in vertical and horizontal basin pattern of Linqing depression, a strong superposition structure of post basin being on the earlier basins.
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