equally, likewise, similarly, in comparison, more, than, less, the least, the most, prefer, as…as, etc.
2.并列类关键词
first, second…finally, and, or, as well as, one… the other, not…nor…, etc.
3.因果类关键词
because of, due to, contribute to, owning to, hence, since, accordingly, consequently, therefore, as a result, result in, result from, lead to, in that, etc.
4.转折类关键词
but, although, though, while, yet, despite, in spite of, otherwise, on the other hand, however, nevertheless, nonetheless, etc.