T 胎兒第十八周，大約有14釐米長，這时候的胎兒能感知外界的聲響

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S 胎儿第十八周，大约有14厘米长，这时候的胎儿能感知外界的声响。

Tāi'ér dì shíbā zhōu, dàyuē yǒu shísì límǐ zhǎng, zhèshí hòu de tāiér néng gǎnzhī wàijiè de shēngxiǎng

18 weeks: Approximately 14cm. The foetus can now perceive sounds from the outside world

由伦纳.尼尔森拍摄的在子宫内发育中的胎儿照片
Photographs of the foetus developing in the womb, by Lennart Nilsson