with several years investigated
经过几年的调查
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Several people have investigated this over the years and have come up with a similar answer: fewer than 1,000.
在过去几年里，有几个人对此进行了调查，并得到相似的答案：不到1000个。
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