【答案】应助回帖

5楼: Originally posted by lechun at 2014-04-23 10:14:42
我写的就是Desulfurization of TBM is  more difficult than  other mercaptans presented in C4  hydrocarbon streams because of steric hindrance from methyl groups.后来排版编辑在than后加了个of。觉得他单独 ...