听说…… It is said that…
众所周知…… As it is widely known that…
据传闻…… According to the rumors, …
据称…… Reports indicate that…
从已知的情况来看…… From what we know, …
据我们所知…… As far as we know, …
很明显/显而易见…… It is evident/obvious that…
首先 Firstly, …
在首要位置 Above all, …
第一且重要的 First and foremost, …
其次 Secondly, …
接下来 Following this, …
然后 Afterward, …
与此同时 Meanwhile, …
最终 Eventually, …
在结束之前 Before concluding, …