huái yùn 
mùlù
yīngwénjièshì
  1. n.:  gestation,  pregnancy,  period of time taken by this
jìnyící
rèn shēn , yùn , huái yùn
bāo hán cí
huái yùn dehuái yùn xīn biàn huàhuái yùn jiān de jiàn kāng yǐn shí