Deep inside the brain, in a region called the hypothalamus (right above where our optic nerves cross) the internal clock is ticking.
在人脑中央深处有个叫做下丘脑的部位(就在视神经交叉处正上方)，人体自带的时钟就在这里运转。
Backbone providers are the Internet players that typically own and lease long-haul fiber-optic cables spanning a large region.
主干网提供商是因特网的玩家，典型的主干网提供商拥有和出租覆盖广阔地区的远程光纤网。
This head CT scan demonstrates a mass with irregular margins in the region of the sella. Such a mass may impinge upon the optic chiasm, just like a pituitary adenoma.
头颅CT显示颅咽管瘤，在蝶鞍可见边缘不规则的大肿块，象垂体腺瘤一样压迫视交叉。
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