今日长难句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；确信；某种
sensitive / ˈsensətiv / adj.感觉敏锐的
expose / ikˈspəuz / adj.暴露；显露
结构分析（图片点击可放大）
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。
预告明日长难句
The explanation for insensitivity to smell seems to be that the brain finds it inefficient to keep all smell receptors working all the time but can create new receptors if necessary.（完形，2005）
