买几双能放进包里的折叠平底鞋(最好是宝石的)，这样你就没有理由天天穿着一双高跟鞋了。
Buy some fold-up flatties (jewelled, preferably) that can slip into a bag so that you have no excuse not to wear a pair of heels now and again.
构造的曲面是分片双三次有理参数多项式曲面。
This surface is a piecewise bi-cubic rational parametric polynomial surface.
她有理由问这样的问题，出于羞愧和骄傲，她把一双手套扔到可他的脸上，抓着他不放。
She had some reason to put the question, for shame pride threw double gloom over his countenance, kept him immovable.
目前，直流电机双闭环调速系统模型主要有理想模型、二阶线性模型以及在不考虑负载扰动或恒负载情况下的非线性模型等。
The DLM model mainly includes the ideal model, the second-order linear model and the non-linear model in constant load or without considering the load disturbance, and so on.
目前，直流电机双闭环调速系统模型主要有理想模型、二阶线性模型以及在不考虑负载扰动或恒负载情况下的非线性模型等。
The DLM model mainly includes the ideal model, the second-order linear model and the non-linear model in constant load or without considering the load disturbance, and so on.
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