The academic language employed in scholarly journals and scientific manuals is radically different from the casual variety you come across everyday in blog posts and newspaper articles. This difference is manifested in different stylistic and lexical aspects. This is probably why many sophomores taking their beginning research methodology course find it hard to compose in such a variety and most often it takes them a lot of practice and reading to acquire the new style.
I have had many problems with it myself and I can still remember the painstaking trouble I went through to do my first literature review. And while learning to write in a solid academic style that gives vigour to your writing does require excessive readings of works written in academic language, there are, however, some practical tips that make this task way easier.