Krueger dips into different sources of data, each one imperfect, trying to build up a compelling picture from opinion polls, biographies of terrorists and broader 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、恐怖分子传记和更广泛的研究来构建一幅令人信服的图景。