常用表达
1. General introduction:
For decades, one of the most popular ideas in __ literature is the idea that __
A common strategy used to study __ is to __
These approaches have been influential in the field because of __
In the past several decades, __ have played an important role in __
Most of the theories of __ are however focused on explaining __
The field has gradually broadened as __
This field of study is sometimes referred as __
This has been widely adopted in the field of __
This field closely follows the paradigm of __
This phenomenon has been widely observed.
2. Problem definition:
The main problem is that __
The methods are not without their problems as will be discussed in __
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