The durability of concrete can be defined as its resistance to deterioration resulting from external and internal causes.

混凝土的耐久性被定义为抵抗外部和内部原因导致的恶化的能力。

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The nonstandard traffic competition and the externalities of transportation are the internal and external causes of "the tragedy of the Commons" for traffic.

交通竞争的失范和交通的外部性是造成交通“共有地悲剧”的内部和外部原因。

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Spontaneous combustion of coal seams is a complicated physical-chemical and environmental process and the result of integrated action of many kinds of internal causes and external conditions.

煤层自燃是一个复杂的物理、化学和环境作用过程，是多种内在原因和外在条件综合作用的结果。

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So we'll be conducting both the internal activity as well as an external review immediately to ascertain the causes and circumstances under which this tragedy occurred.

CNN: O'Keefe: 'A tragic day for the NASA family'