1.以下词组提示下文所涉及的重要信息:
The main / important point / conclusion / reason….
The point to note here…
2.以下词组提示了下文的结构框架:
There are three major reasons…
3.but 和 however表示对比,常常用来提示重要信息,例如:
The rising birth rate is not due to increased fertility, but to a sharp decline in the death rate.
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