The fact that ResearchGate restricts its user accounts to people at recognized institutions and published researchers may explain the disparity in active usage, as a high percentage of the accounts on Academia.edu are lapsed or inactive.
研究人员将其用户账户限制在公认的机构和公布的研究人员可以解释在主动使用方面的差异，因为在 Academia.edu 的账户中有很高比例已经失效或不活跃。