坝踵裂缝扩展是重力坝破坏的开始。应该用断裂力学方法校核坝踵裂缝的稳定性，并以此作为重力坝稳定的补充条件。
Stability of the crack should be checked by the method of fracture mechanics, which should be a supplemental stability condition of the gravity DAMS.
惟一要补充的是，必须满足以下条件：使用函数从AttributeDesignator返回的多个值中提取一个值。
The only additional thing that you need to do for the condition is to use a function to extract one value from the multiple that are returned by the AttributeDesignator.
科学家在不同的条件下对这种材料进行了测试，发现即使是在阴天、多云天气或是雨天，它也能够迅速、重复地补充能量。
The scientists tested this material in a variety of conditions and found it could be rapidly and repeatedly charged even if the day was cloudy, overcast or rainy.
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