Only a handful of studies have analyzed the heart effects of smokeless tobacco, and the findings are not as strong as the researchers expected..只有少数的几个研究分析了无烟烟草对健康的影响，得出来的结并不如所预期的那样联系紧密。
smokeless英语解释无烟的；不冒烟的英释中释adjtobacco that you chew rather than smoke
smokeless短语和解释smokeless tobacco,无烟烟草.短语
