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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 / | 
