1. The present models used in seismic response analysis of arch darns, such as Fenves'model and Dowlings'model, have the shortcodring that the accuracy to simulate the contact state between cracked surfaces is not high.
目前在拱坝地震反应分析中应用的一些模型，如Fenves模型、Dowling的三参数模型，存在对缝界面的接触状态模拟精度不高的问题，这对于准确评价工程上关心的经界面最大张开度是不足的。
2. My aunt darns well.
我姑妈善织补。
3. Tan darns her shoes around the platform and, if the shoes have gotten too soft while breaking them in, she'll add glue to the box to get back the appropriate amount of stiffness.
谭会将舞鞋绕着平台补缀，同时，若舞鞋因久穿而变地太软时，谭会用胶在舞鞋内部衬垫处补强以恢复它们原来适当的硬度。
4. The Effect of Different Darns on Quality Characteristic of Raw Tobacco
不同类型烤房对原烟质量特征的影响
5. His clothes were a fine, deep, glossy black; and yet they looked like the same suit; nay, there were the very darns with which old acquaintance had made us familiar.
他的衣服黑得细腻淳深而且光鲜，但仍然能看出来还是那件原来的衣服。哦不，这不就是那些一样的补丁吗，怪不得让我们感觉那么熟悉