Hot-air balloons are truly full of hot air. The pilot uses the burner to control the temperature of the air inside the envelope. If the pilot increases the flame and heats more air, the balloon will rise higher. However, the pilot cannot really control which direction the balloon flies because the balloon is pushed by the wind. This means that a pilot must understand the wind conditions for that day and pay attention to the weather.
熱氣球確實充滿了熱空氣。飛行員會用燃燒器控制球皮裡空氣的溫度。如果飛行員增大火勢並加熱更多空氣，熱氣球就會升得更高。然而，飛行員無法真正控制氣球飛行的方向，因為氣球是被風推動的。這意味著飛行員必須瞭解當天的風況並注意天氣。
生活必備字詞：
be full of... 充滿……
flame n. 火焰
pay attention to... 注意∕留意……
Lisa didn’t pay attention to what Harry was saying.
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本文節錄自《常春藤生活英語》雜誌，完整內容請見七月號。
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