[<< wikibooks] Pinyin/Ovum
See also
Ovum is the reproductive cells of female animals. Oocytes secondary to oocysts, upon maturation became ovum.
Luǎnzǐ shì cíxìng dòngwù de shēngzhí xìbāo. Luǎnxìbāo (yóu cìjí luǎnmǔxìbāo chǎnshēng) chéngshú hòu chéngwéi luǎnzǐ.

In mammals, ovum is made by the ovaries. All mammals upon birth, already have immature oocytes stored in ovaries. The amount of oocytes will not increase after birth. Ovum and sperms combine, ovum became fertilized by sperms and became zygote, for which a new life begins. Some animals, for example birds undergo internal insemination, whilst other animals for example a majority of fishes, and amphibians, undergo external insemination.
Zài bǔrǔdòngwù shàng, luǎnzǐ shì yóu luǎncháo suǒ chǎnshēng de. Suǒyǒu bǔrǔlèi zài chūshēng shí, luǎncháo nèi yǐjīng yǒu háiwèi chéngshú de luǎnzǐ cúnzài, érqiě zài chūshēng hòu luǎnzǐ shùmù bù huì zēngjiā. Luǎnzǐ hé jīngzǐ jiéhé shòujīng biàn xíngchéng shòujīngluǎn, jiùshì yīgè xīn shēngmìng de kāishǐ. Yīxiē dòngwù (lìrú niǎolèi) shì jìnxíng tǐnèi shòujīng de, ér lìngyīxiē dòngwù (lìrú dàbùfèn de yúlèi hé liǎngqīlèi dòngwù) zéshì jìnxíng tǐwài shòujīng.