前人研究的回顾共调查了将近17,000个儿童。
The review of previous studies looked at nearly 17, 000 children.
他发现前人研究究地理的记载有许多很不可靠的地方。
Instead he found a lot of unreliable points in the geographic records taken by his predecessors.
如果我们想在当今科研中取得更大的进步，就必须以前人研究的成果为基础。
If we want to make more progress in our present study, we must base our research on previous theories and results.
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