随着宇宙的膨胀，辐射逐渐冷却，残余下来的就是我们今日所见的情况。

As the universe expanded, the radiation would have cooled until it is just the remnant we see today.

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结果表明，应力腐蚀是该膨胀节失效的主要原因，而局部的点蚀和残余应力、工作应力是应力腐蚀的必要条件。

The results show that the stress corrosion is the main failure causing of the bellows expansion joint, while the local pit corrosion, residual stress and the working stress is the necessary condition.

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膨胀期越长，坝中心温度应力最大值越小，最终残余温度应力越小，对坝体混凝土的抗裂性有利。

The longer of expansion period, the smaller of dam center's maximum thermal stress; and the final residual thermal stress, which can benefit the concrete's anti-cracking quality.

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