embryofetal origin胎: foetus; embryo元: first; primary胎元不固: liability to be abortion胎婴死亡率: fetal death rate胎原性难产: fetal dystocia下载手机词典可随时随地查词查翻译关注微信公众号:chachacidian,回复:胎元,即可在微信中查询翻译