in a/one word 简言之、一句话、总之

generally speaking 一般说来

in short=in a few words 简言之

in conclusion=lastly 最后地

on the whole=taking everything into consideration 从总体来看、大体上

so 所以

therefore 因此

thus 这样

as has been mentioned 正如所提到的

it is quite clear that 很显然

there is no doubt that 毫无疑问

it is well-known that 大家都知道

as we all know=as is known

to us all 大家都知道

as/so far as I know 据我所知

to sum up=to summarize=in summary 总之

13、表示转折话题

by the way 顺便说

I am afraid 我恐怕

in my opinion 依我看来

to tell the truth 说实话

to be honest 诚实地说

in face 事实上