第033句
The explanation for insensitivity to smell seems to be that brain finds it inefficient to keep all smell receptors working all the time but can create new receptors if necessary.
译文:嗅觉迟钝似乎可以解释为,大脑无法保证所有的嗅觉接收器一直处于工作之中,却可以在必要时创造出新的接收器。
点睛:that引导的是表语从句,其中finds和can create为并列的谓语动词。it为形式宾语,真正的宾语是to keep…all the time。现在分词短语working all the time为smell receptors的补足语。if necessary为省略句,其完整形式应为if it is necessary。