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It's what every expectant parent wants to know - who their baby will look like.
每個充滿期待的父母都希望知道自己的孩子會長成什么樣。

And this fascinating video goes some way to showing how.
而這個有趣的視頻將告訴你人臉是怎么形成的。

Produced for the BBC series Inside the Human Body that was aired last year, the animation is based on scans of a developing embryo and captures the formation of the face in the womb.
BBC去年公布了這部探秘人體秘密的系列視頻，其動畫場景是根據(jù)對胚胎發(fā)育過程的掃描以及子宮內(nèi)部人臉的形狀捕捉影像而設(shè)計的。

The video reveals how sections of the face grow and fit together like a puzzle just three months after conception.
視頻解密了懷孕前三個月人臉發(fā)育成型的過程。

BBC’s Michael Mosley said: 'The three main sections of the puzzle meet in the middle of your top lip, creating the groove that is your philtrum.'
BBC的Michael Mosley說：“謎團(tuán)的重點主要集中在上唇中部的發(fā)育，以及其周邊皺紋的變化即人中的形成?！?/div>

The 30-second clip strings together 3-D models of the developing face based on scans taken in the first trimester.
30秒長度的影片串聯(lián)起不同發(fā)育階段的3D人臉模型，這些都是根據(jù)孕期前3個月掃描影像編輯設(shè)計的。

'It was a nightmare for structures like the nose and palate, which didn’t exist for most of the animation,' graphics researcher David Barker told New Scientist.
影像學(xué)研究人員David Barker對《新科學(xué)家》雜志表示，動畫中沒有出現(xiàn)類似鼻子和下顎的形狀，看上去非常可怕。

'Their formation is a complicated ballet of growth and fusion of moving plates of tissue.'
他說：“組織的發(fā)育和融合過程如同芭蕾舞般復(fù)雜?！?/div>

Plates of tissue that fuse at the philtrum, which can be long or short and deep or shallow, depending on a person’s genetic makeup.
皮膚組織在下顎處聚集。這個地方可長可短，可深可淺，其具體形狀是依據(jù)基因構(gòu)成而變化乃至最后成型。

The failure of those plates to fuse can cause a cleft lip or palate. And a smooth philtrum can signal disorders like fetal alcohol syndrome.
如果這塊皮膚組織沒有發(fā)育好，那就會形成唇裂或者顎裂。而如果人中部分過于平滑就表示可能患有胎兒乙醇綜合征或其他類似的肌體紊亂。

'This whole amazing process – the bits coming together to produce a recognisable human face – happens in the womb between two and three months,' said Mr Mosley. 'If it doesn’t happen then, it never will.'
“這一整個令人驚嘆的過程絲絲剝繭，最后呈現(xiàn)出一個人臉的基本輪廓。這一系列過程都是在懷孕第二到第三個月，在母體的子宮中完成的?！?Mosley說，“一旦跳過這個過程，生命就無法繼續(xù)成長?！?/div>