The phenomenon could be caused by mothers getting more sun in pregnancy - and passing on higher quantities of vitamin D to their unborn infant.
导致此类现象的原因可能是母亲在孕期接受的日照更多，然后将大量的维生素D传输给了他们还未出生的婴儿。
Human babies sometimes fall victim to a similar phenomenon named sudden infant death syndrome, the cause of which is still unknown.
人类婴儿有时也会患上类似的病症，这被称为“婴儿猝死综合症”，其产生原因尚不明确。
Further research about infant vocalizations could reveal that babbling is a much more widespread phenomenon in mammals than was previously thought.
对于幼仔发声的更多研究可能揭示出哺乳动物牙牙学语要比以往我们所认为的广泛很多。
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