2、结尾：taking all these factors into consideration, we naturally come to the conclusion that…把所有这些因素加以考虑，我们自然会得出结论…
3、 that iswhy +句子那是.. .的原因。
4、 that is because +句子那是因为...
5、it goes without saying that +句子不言而喻，毫无疑问。
6、 there is no need to do没必要做...
7、 there is no point in doing做某事毫无意义。
8、 had better (not) do最好不)做。