单词：canvasing
vt. 用帆布覆盖（canvas的现在分词形式）
v solicit votes from potential voters in an electoral campaign
v get the opinions (of people) by asking specific questions
v cover with canvas
v consider in detail and subject to an analysis in order to discover essential features or meaning
v get the opinions (of people) by asking specific questions
v cover with canvas
v consider in detail and subject to an analysis in order to discover essential features or meaning