Pinyin/Leaf

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English version

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.

Hanzi version

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,使它能吸收更多光;和薄的,使太阳光能到达它细胞的叶绿体。大多数叶子有气孔,能打开和关闭。它们与大气交换,调节二氧化碳,氧气,和水气。

Pinyin version

Yèzi shì dìmiàn shàng de zhíwù qìguān. Tā de zhǔyào gōngnéng shì guānghézuòyòng hé qìtǐ jiāohuàn. Yèzi tōngcháng shì biǎnpíng de, shǐ tā néng xīshōu gèngduō guāng; hé báo de, shǐ tàiyáng guāng néng dàodá tā xìbāo de yèlǜtǐ. Dàduōshù yèzi yǒu qìkǒng, néng dǎkāi hé guānbì. Tāmen yǔ dàqì jiāohuàn, tiáojié èryǎnghuàtàn, yǎngqì, hé shuǐqì.