It was not possible to travel straight through because of the Rocky Mountains and the deep snow that fell in winter.
VOA: special.2010.04.26
Ok it's not comfortable, but I'm living through this and I've met these people that helped me through that process.
的确,没有舒适的环境,但是我挺过来了,我遇到了这些帮助我的人,和我一同渡过难关。
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
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