Normal comets fall into the inner regions of the solar system from icy reservoirs in the distant Kuiper belt and Oort cloud.

通常来说，彗星来自距离遥远且冰天雪地的柯伊伯带和奥尔特星云然后掉入太阳系中的内层区域。

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One can lead a normal, ordinary life, and yet display inner emotional and mental detachment.

人都可以过上正常的，平凡的生活，但是也都可以显示出内心的情感与精神的脱离。

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To show a component's inner structure, you merely draw the component larger than normal and place the inner parts inside the name compartment of the encompassing component.

为了显示组件的内部结构，你只需把组件画得比平常大一些并在名字区内放置内部的部分。

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Several weeks later, although hearing sensitivity had recovered to normal levels, activity in the auditory nerve connecting the inner ear to the brain remained impaired.

BBC: Viewpoint: Does deafness contribute to dementia?

The number of channel molecules present means that, in normal circumstances, about 70% of the free-floating outer channels are lined up with tethered inner ones at any given time, with each dual channel letting through about 1m sodium ions per second.

ECONOMIST: Medical diagnostics

"If there is only a problem in its inner layer, it may be possible to replace just that part of the cornea, leaving the patient's normal and healthy tissue in place, " said Mr Muhtaseb, a Singleton-based consultant ophthalmologist.

BBC: New eye surgery shortens recovery