1.唯一级标志词

　　only / unique / prefer / every / one / of all / perfect /

　　2.因果项标志词

　　cause / lead to / contribute to / thanks to / owing to / question / answer / why / reason / 其他形式的问句 /

　　3.转则项关键词

　　despite / in spite of / instead / while / from ~ to ~ / although ~ (yet)~ / not only ~ but also ~ /

　　4.序数项标志词

　　所有的序数词(first , second)/ another / the other / next / last / in addition / on the other hand /

　　5.时间项标志词

　　when / how / today / as / before / after / since / then / until /

　 6.解释项标志词

　　or / namely / in other words / that is / that is to say /

　　7.目的项标志词

　　to / for /

　　8总结项标志词

　　all in all / in brief / to conclude / at last / in summary / in short /

　　9.强调项标志词

　　副词：especially / particularly / almost / always / usually /

　　动词：show / remember / note / notice / say / pronounce /