请教一句话的理解

cherry123

og11阅读16篇中一句话不太理解，虽然答案选对了，看了解释也有点不明白确切含义，尤其是括号中的意思。

Duverger's research findings were that women voted somewhat less frequently than men(the difference narrowing the longer women had the vote) and were slightly more conservative.

谢谢！

顾风

XXX的研究妇女投票比男的少，并且比男的保守，(不过这种差别在投票久的妇女上比较小)

cherry123

谢谢！