由于周围大气温度的变化，桥梁上部结构产生的温度变形是一个客观存在的事实。

Due to the atmosphere temperature change, the bridge superstructures' thermal deformation exist impersonality which is a fact.

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这些大气微粒通过两种途径作用于冰川：首先，悬浮在空气中的微粒吸收太阳光，升高周围空气温度。

These particulates can melt ice in two ways. First, floating in the air, they absorb sunlight and heat the surrounding atmosphere.

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