quantitative phrase : riddle : comparative philology : metallurgy > twin
Contents
A twin birth
　　A twin birth. Are the same or very similar to those metaphors. "Dialects" Third: "between Chen Chu, mortal Xu milk and double production, that of determining breed; Qin Jin Lian between that of the child; from off the East, Zhao Wei, between that of the twins." Clarify and state the amount of "Night Tan recorded with twin ":" with the state has twin brothers who, in the 20, appearance are the same good sound a smile, though often Wu family consensus. "Qing zhen" Yi Hai Miscellaneous Poems "of 32:" He only Lang stressed the twin, not home for the brothers, according to the text, complete with star life different hobbies, Dairo in particular clear your Erlang. "Bing" to the young reader "9:" She pointing me: there is a Vega, that is cows, There are fairy stars, Orion, twin brother of star. "
Translated by Google
No. 2
　　1.孪生(twins)：人体一次妊娠分娩两个胎儿。通常称为双胞胎。孪生可分为单卵(同卵)孪生(monozygotic twins)和双卵(异卵)孪生(dizygotictwins)。前者在双胎中的出现率小于后者。
　　2. 孪生指在切应力作用下，晶体的一部分沿一定晶面和晶向，相对于另一部分所发生的切变。补一句：“孪生就是双胞胎。”
概念
　　孪生是指母体一次妊娠分娩两个胎儿，俗称双胞胎。
形成原因
　　一般女性在一次月经周期中，排卵一次，每次为一个，但也有超过一个的。
　　若女性在一次月经周期中，排卵超过一个，而且卵子全部受精成功发育成胚胎或因为不明原因一个卵子分裂成两个并独自发育成胚胎，就有可能形成孪生，也就是双胞胎。
分类
　　孪生分两为种：
　　1、单卵孪生或称同卵孪生
　　一个受精卵因为不明原因而分裂成两个，并各自发育成胚胎而出生的胎儿即为单卵孪生或称同卵孪生
　　单卵孪生出生的胎儿必定为两个男性胎儿或者两个女性胎儿。
　　2、双卵孪生或称异卵孪生
　　女性在一次月经周期中，排卵两个而且两个卵子都受精成功发育成胚胎而出生的胎儿即为双卵孪生或称异卵孪生
　　双卵孪生出生的胎儿可能是两个男性胎儿或两个女性胎儿，也有可能是一男一女两个胎儿。
百科辞典
　　luansheng
　　孪生
　　twinning
　　　　见范性形变。
　　　　
English Expression
  1. n.:  twinning,  born as twins
  2. vt.:  twin
French Expression
  1. n.  jumeau
Related Phrases
hippocampusspacemanAltmanSay'ūn
Containing Phrases
twinsiamesetwin