当腺苷在清醒状态下释放的总量逐渐增加时，腺苷就会与大脑特定区域越来越多的细胞结合。
Adenosine then binds to more and more sites on cells in certain areas of the brain, as the total amount released gradually increases during wakefulness.
他的理论是，随着船只的使用，人们沿着因海平面下降而暴露的大陆架逐渐移居到未冻结成冰的区域。
He theorized that with the use of watercraft, people gradually colonized unglaciated refuges and areas along the continental shelf exposed by the lower sea level.
在许多半干旱的地区中，同样存在树带界限的下限区域；在这片区域之内，由于缺乏水分，森林下沿区域的植被通常会逐渐变成干草原或沙漠。
In many semiarid areas there is also a lower timberline where the forest passes into steppe or desert at its lower edge, usually because of a lack of moisture.
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