1.第一 In the first place/firstly First and foremost 首要的是；首要的 To begin with 首先 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.. 2.第二 Secondly/second 第二，其次 In the second place 第二；其次 What is more 而且更有甚者 Further more而且，此外 Moreover 此外；而且；同时 3.第三 Thirdly 第三 Besides/Additionally 此外 In addition 除此之外 Besides what's mentioned above, it's necessary to think about... 除了上面提到的，还有必要考虑一下 In addition to what's talked about above ...think about 除了上面提到的东西有必要考虑一下 ……