出生早三个星期的婴儿肺部成熟了，却可能不会进食，因为大脑还未完全发育。
A baby born three weeks early with mature lungs may not be ready to eat because the brain's not fully developed.
这类易感人群包括一旦感染死亡率极高的老人和免疫系统未完全发育的婴儿。
Such vulnerable types include the elderly (who are the most likely to die if infected) and infants (whose immune systems are not fully developed).
特别是他们额叶的髓鞘并未完全发育。
In particular, they're not fully myelinated in their frontal lobes.
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