一、常用先后分层模式：首先：first， firstly， at the first place， the most important comes first第二/其次：then， second， secondly， in the next place第三/最后：third， thirdly， last but not least总之：all in all， in brief， in a word， in short每当提到/关于：When it comes ， Referring 尽一切努力：spare every effort to， try one's best to在我看来/我的观点是：in my opinion， as far as I can see，
