And at around 10 months, their brain activity compares to that of premature human infants.

在大约 10个月大时候，其大脑活动与早儿类似。

While it rarely occurs in full-term infants, it is most common in premature infants.

然在足月婴儿中很少发生，但在早儿中最为常见。

Premature infants face a host of complications, but their tiny, underdeveloped lungs are especially at risk.

早儿面临许多并发症，但他们发育不全小肺部尤其危险。

The problem was that when oxygen was limited to many of these premature infants, their brain didn't get enough oxygen to develop. Many of them developed retardation.

问题在于，当许多早儿气受到限制时，他们大脑无法获得足气来发育。他们中许多人发展迟缓。

So if a premature infant takes a breath of harsh, dry air, the immature alveoli can be badly overworked and start to scar, which could lead to chronic lung disease.

因此，如果早儿吸入刺鼻、干燥空气，未成熟肺泡就会严重过度劳累并开始形成疤痕， 这可能导致慢性肺病。