请问一个英语问题英语课本中有这个句子：...it is human activity that has caused t

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请问一个英语问题
英语课本中有这个句子：...it is human activity that has caused this global warming rather than a random but natural phenomenon.这句话的意思是：地球变暖正是人类活动导致而成的,并非是一种无规律的自然现象.是我不理解的是,在这个句子中but的作用.请英语高手指教!

ut在这里的作用是“轻微转折”,即but前后两个形容词肯定不是近义词,但也不是完全的反义词,是意思上有轻微转折的两个词.
比如：He is a short but bright boy. 他是一个个子有点矮但是很聪明的男孩儿.

请问一个英语问题英语课本中有这个句子：...it is human activity that has caused t 请问It is caused by heavy traffic.句子中caused是什么词性?为什么不能用canus这个英语：请分析这个句子 I don't know how long it is that he has staye 有几个英语问题1.It has four legs.It can't run.What is it?2.What has 【英语】请问这个句子是不是有问题? 帮我看一个英语句子we can reach the conclusion that it is beneficial t 问一个英语句子的问题There is an expression to get cold feet that has n 一个英语问题句型“It’s / It has been + 一段时间 + since + 时间状语从句”中什么时候用is 英语作文中常用一个句子there is no denying that还是it is no denying that来着英语语法问题不是有一种从句时It is +形容词+that+句子请问下这个是什么从句?然后请问下that后面是加有主语的请问英语句子中that is causing this的分析英语翻译The scientists warn that human activity is hastening ext