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      1. 2019托福聽力PartC原文整理4

        托福考試網 鯉魚小編 更新時間:2019-07-10

        Today I want to talk about the Earth's last major climatic shift, at the end of the last ice age.

        今天我想談談關于地球上一次主要的氣候改變,在上個冰河時代的末期。

        But first, let's back up a moment and review what we know about climatic change in general.

        但首先,讓我們倒退一會兒,并大體上回顧我們所了解的氣候變化。

        First, we defined "climate" as consistent patterns of weather over significant periods of time.

        首先,我們定義的“氣候”是依照一致的模式,跨越了有效的時間周期的天氣。

        In general, changes in climate occur when the energy balance of the Earth is disturbed.

        通常,在氣候上的變化發生在地球能量平衡被擾亂的時候。

        Solar energy enters the Earth's atmosphere as light and is radiated by the Earth's surface as heat.

        太陽能以光的形式進入地球大氣,并且經由地球表面以熱的形式被輻射。

        Land, water, and ice each affect this energy exchange differently.

        陸地,水和冰,每一種(媒介)都在不同程度上影響了這種能量交換。

        The system is so complex that to date, our best computer models are only crude approximations and are not sophisticated enough to test hypotheses about the causes of climatic change.

        該系統是如此復雜以至于,迄今為止,我們最好的電腦模型也僅僅只是粗略的近似值,而且精度不足以檢驗關于氣候變化原因的假說。

        Of course, that doesn't keep us from speculating.

        當然,這個不妨礙我們猜測。

        For instance, volcanic activity is one mechanism that might affect climatic change.

        例如,火山活動可能是影響氣候變化的一個途徑

        When large volcanoes erupt, they disperse tons of particles into the upper atmosphere, where the particles then reflect light.

        當大的火山群噴發時,它們撒播了很多的微粒進入上面的大氣層中,于是這些微粒在那里反射了光。

        Since less light is entering the system of energy exchange, the result would be a cooling of the Earth's surface.

        由于較少的光進入了能量交換系統,結果會是地球表面的冷卻。

        Of course, this is just one possible mechanism of global climate change.

        當然,這只是全球氣候變化的可能的途徑之一。

        In all probability, a complete explanation would involve several different mechanisms operating at the same time.

        很可能,一個完整的解釋會牽涉幾種不同的途徑在同一時間起作用。

        以上就是鯉魚小編準備的內容了,大家看完有沒有覺得心中的困惑少了不少呢,關注鯉魚網,獲取更多考試資訊及學習資料。

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