一只完全发育的灰熊，一天可以吃掉50磅的食物。

A full-grown grizzly can eat 50 pounds of food a day.

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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).

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另一种完全不同的理论认为，打呵欠有助于生命早期肺部的生理发育，但对成年人没有任何剩余的生理功能。

A completely different theory holds that yawning assists in the physical development of the lungs early in life, but has no remaining biological function in adults.

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That also happens through development, and in fact, it goes through development and even teenagers are not fully myelinated.

髓鞘的形成也同样发生在发展过程之中,实际上,髓鞘的形成贯穿整个发展过程,即便是青少年的髓鞘也并未完全发育完善

耶鲁公开课 - 心理学导论课程节选

In particular, they're not fully myelinated in their frontal lobes.

特别是他们额叶的髓鞘并未完全发育

耶鲁公开课 - 心理学导论课程节选