被抽样调查的儿童把他们迅速减少的“空闲时间”的四分之一都花在了看电视上。

The children sampled spent a quarter of their rapidly decreasing "free time" watching television.

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要减少执行时间，除非规则是柱状的，否则，在可能的情况下采用虚拟表，并避免使用抽样。

To reduce execution time, unless the rules are columnar, you should use virtual tables where possible, and avoid using sampling.

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他们按社会经济地位为抽样中的男性赋予不同的分值，分值范围从0到96，时间接近1950年(尽可能的接近1910年)。

They then assigned the men in the sample a socioeconomic status score between zero and 96, on a scale drawn up in 1950 (which was as close to 1910 as they could get).

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