希望这些可操作性的研究对中学地理教学有一定的启示与帮助。
I hope this operational research can be of great help to the senior geography teaching.
队列研究临床可操作性高，但其控制偏倚差。
Cohort study has a high clinical operation, but it is difficult to control bias.
队列研究临床可操作性高，但其控制偏倚差。
Cohort study has a high clinical operation, but it is difficult to control bias.
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