Only on the time scale will various processes and affairs of environmental evolvement have their own exact meanings, which can bring us some laws at present.
对于各种环境演化过程和环境演化事件，只有将其置于时间标尺之上才有确切的意义，也才能从中找出规律性的东西。
Environmental isotope and nuclear techniques provide unmatched insights into the processes governing the water cycle and its variability under past and present climates.
环境同位素和核技术提供无敌的对在过去和现下气候区下管理水循环和它的变化性的过程了解。
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