Krueger dips into different sources of data, each one imperfect, trying to build up a compelling picture from opinion polls, biographies of terroristsbroader studies.

• 克鲁格浏览了不同来源的资料（每个来源都有缺点），试图根据民意调查、恐怖分子传记和更的研究来构建一幅令人信服的图景。