1919年，清华大学首次规定学生必须游泳，但后来由于学生人数过多，学校也没有足够的游泳池供学生学习游泳而放弃了这一规定。

Tsinghua University first made swimming a requirement in 1919 but later gave it up because the number of students became too large and there were not enough swimming pools in the school for them to learn swimming.

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如果在一定时间段内输入错误密码次数过多，一些网站就会锁定账户，希望以此来抵御黑客攻击。

Some Web sites try to thwart the attackers by freezing an account for a certain period of time if too many incorrect passwords are typed.

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在前面两个专栏中，谈到不必要的SQL，并给出了执行次数过多的SQL例子，以及应当由更新的、性能更优的SQL来替代的例子。

In my two previous columns, I wrote about unnecessary SQL and gave examples of SQL that is executed far too many times and SQL that should be replaced with newer, better-performing SQL.

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