递进型:besides.what's more.let alone.moreover.further more
解释型:that’s to say.in other words.
转折型:however.but.yet.otherwise.on the contrary.instead
因果型:because(of).due to.thanks to.as a result.consequence.therefore
让步型:though.although.in spite of.despite
总结型:in a word.in short.to sum up.in conclusion.on the whole
见解型:in my opinion.personally speaking.as far as I am concerned