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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

叶子 是 地面上的 植物 器官. 它的主要功能是光合作用和气体交换。叶子通常是扁平的，所以它能吸收更多光；并且很薄，所以阳光能到达细胞中的叶绿体。大多数叶子有气孔，可以打开和关闭。它们与大气交换，调节二氧化碳、氧气和水蒸气。