❶开头 It's said that... 据说…As we all know that...我们都知道…It's well known that... 众所周知... As/So far as I know...据我所知...It is clear/obvious that…是显而易见的 ❷第一 In the first place 首先，从一开始First and foremost 首要的；第一To begin with 首先，起初The most important factor that we have to take into consideration is ...我们必须考虑的最重要的因素是... ❸第二 Secondly 第二，其次In the second place 其次，第二点What is more 而且，此外，更有甚者Furthermore 而且，此外Moreover 此外;而且；同时