canvass的词根为canva

例句

1、

I saw her father with his rosette on， canvassing for the Conservatives

我看见她父亲戴着玫瑰花结，正在为保守党游说拉票。

2、

The candidates canvassed right up to election day.

候选人们直到选举日之前一直在游说拉票。