However, it has been found that even people insensitive to a certain smell at first can suddenly become sensitive to it when exposed to it often enough.(完形,2005)
insensitive / inˈsensətiv / adj.无感觉,无反应,未意识到的
certain / ˈsə:tn / adj.确定的;确信的;某种
sensitive / ˈsensətiv / adj.感觉敏锐的
expose / ikˈspəuz / adj.暴露;显露
翻译:
然而,研究发现,即使是开始对某种特定气味不敏感的人,如果经常接触这种气味,也会突然变得对它敏感起来。