达累斯萨拉姆市中心的大部分建筑年事已久，低矮的混凝土建筑物长期暴露在热带的湿气中，呈现出灰暗的发霉阴影。

For the most part, downtown Dar was built long ago, and its low-slung concrete buildings, long exposed to the moisture of the tropics, have taken on a musty shade of gray.

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最重要的可能是，他们需要从暴露在赤道阳光下的住所和活动场所迁到火柴盒似的高层建筑物内。

Perhaps, most importantly, they had traded family compounds and regular exposure to the equatorial sun for cloistered high-rise apartments.

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暴露条件指建筑物除了承受的机械作用之外，还有暴露所处的化学和物理条件。

P Exposure conditions are chemical and physical conditions to which the structure is exposed in addition to the mechanical actions.

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