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 __ 其他部分见图片‼️