随机抽样调查;
Also, this was a non-random sample.
还有, 这是[ 非 随机]抽样.
The survey used a random sample of two thousand people across England and Wales.
该调查在英格兰和威尔士随机抽样了2,000人。
A random sample of 50 flights was taken over a 30 period.
50个航班随机抽样样本是经过30天获取的.
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