3. 表示空間順序：1.表示時(shí)間:now,then,suddenly,before,afterwards,later,so... | 2.表示空間順序:first,secondly, far,above,below,near,beside,to the right,on one side... | 3.表示目的:for this purpose,for this reason,so that...
4. 第二層次(其次)：主要因素是: The main factor is that...... | B 第二層次(其次): Second, Secondly, In the second place, Next, Then , For another | 另一種方法是......Another means of ......is to ......
secondly詞典解釋
1. (用于列舉觀(guān)點(diǎn)或給出原因)第二，其次 You say secondly when you want to make a second point or give a second reason for something.
e.g. You need, firstly, a strong independent board of directors and secondly, an experienced and dedicated staff. 你首先需要一個(gè)強大的獨立董事會(huì )，其次需要一批富有經(jīng)驗并且愛(ài)崗敬業(yè)的員工。