Pinyin/Conjoined Twins

Conjoined twins is a rare pregnancy phenomenon, it is formed by the splitting of a single zygote. What is different from monozygotic twins in normal pregnancy process, is that zygote is not completely separated within the first two weeks, partially separated zygote continue to mature, resulting in a conjoined fetus. This usually happen approximately at the first two weeks of pregnancy, the karyotypes, sex, blood types, hair colours, fingerprints, etc. of the two fetuses are all the same. There is about a case of conjoined twins per 100 thousand pregnancies, most conjoined twins die within the embryonic period, the success rate of childbirth only is one per 200 thousand.

Liántǐrén shì yīgè hǎnjiàn de huáiyùn xiànxiàng, tā shì yóu dāndú de yīgè shòujīngluǎn fēnliè érchéng. Yǔ zhèngcháng de dānluǎn shuāngbāotāi huáiyùn guòchéng bùtóng de shì, shòujīngluǎn zài zuìchū liǎnggè xīngqī nèi méi néng wánquán fēnlí, júbù fènlí de shòujīngluǎn jìxù chéngshú, jiéguǒ jiù xíngchéngle yīgè liántǐ de tāi'ér. Zhè yībān fāshēng zài huáiyùn de zuìchū liǎnggè xīngqī zuǒyòu, liǎnggè tāi'ér de rǎnsètǐhéxíng, xìngbié, xuèxíng, máofǎ yánsè, zhǐwén děng dōu xiāngtóng. Měi 10 wàn gè huáiyùn yuē yǒu yīgè liántǐtāi'ér bìnglì, duōshù liántǐtāi'ér sǐ yú pēitāiqī, fēnmiǎn chénggōnglǜ zhǐyǒu 20 wàn fēnzhī yī.