文献简介 1. Recently investigators have examined the effects of X on Y. 2. In the past two decades a number of researchers have sought to determine ...... 3. Previous studies have reported ...... 4. A considerable amount of literature has …
文献简介
1. Recently investigators have examined the effects of X on Y.
2. In the past two decades a number of researchers have sought to determine ......
3. Previous studies have reported ......
4. A considerable amount of literature has been published on X. These studies ......
5. Smith (1984: 217
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