The exercises for today, which should be done about three or four times for not more than a minute or so at most each time, are to be practiced in a somewhat different way from the preceding ones.
今天的观念需要练习三、四次，每次最多不超过一分钟，练习的方式亦与先前有所不同。
Every time I record audio, I fumble my way through saying each sentence many, many times, and then I go back in and pick the ones where I think I suck the least.
每当我录音的时候， 我总是笨手笨脚的， 一句话要说好多好多遍。 然后当我剪辑的时候， 我就会挑一个我觉得最不糟糕的。
What is the most efficient way of doing this short of trying to delete each one at a time and letting it cause SQL errors on the ones that violate constraints?
什么是最有效的方法做到这一点，试图一次删除每一个，让它导致SQL错误违反约束的错误？
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