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英文版本

A leaf is an above-ground plant organ. Its main functions are photosynthesis and gas exchange. A leaf is often flat, so it can absorb more light, and thin, so that the sunlight can get to the chloroplasts in the cells. Most leaves have stomata, which can open and close. They regulate carbon dioxide, oxygen, and water vapor exchange with the atmosphere.

拼音版本

葉子 是 地面上的 植物 器官. 它的主要功能是光合作用和氣體交換。葉子通常是扁平的，所以它能吸收更多光；並且很薄，所以陽光能到達細胞中的葉綠體。大多數葉子有氣孔，可以開啟和關閉。它們與大氣交換，調節二氧化碳、氧氣和水蒸氣。