Although clouds appear and disappear just like magic, scientists can explain how it happens. The process usually begins in the late morning, when the Sun heats up the Earth’s surface. As the ground temperature increases, bubbles of warm air form and start to rise up into the sky. These air bubbles keep rising higher and higher like hot-air balloons. Finally, they are cooled down by cold air as they reach great heights. When the air bubbles get cooler, they can no longer hold all the moisture they contain.
雖然雲像魔法般出現又消失，科學家們可以解釋這是如何發生的。這個過程通常在上午晚些時候開始，當太陽使地球表面升溫時。隨著地面溫度升高，暖空氣的氣泡形成並開始升上空中。這些氣泡像熱氣球一樣持續越升越高。最後，當它們到達很高的高度時，會因冷空氣而降溫。氣泡降溫時，它們無法再容納其所含的所有水分。
生活必備字詞：
bubble n. 氣泡
cool down... / cool... down 使……降溫
moisture n. 水分
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本文節錄自《常春藤生活英語》雜誌，完整內容請見八月號。
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