The theory of transformation not only became the mainstream to grasp the argument in 1990s, but it is the root that gave birth to many new concepts in literature theory.
由此而逐步形成的转型理论不但可以成为掌控九十年代众多文学争论的主线，而且也是许多文学理论新概念出现的理论根源。
The existence of vulnerability in agricultural drought system is the root that leading drought to disaster.
农业旱灾脆弱性的存在是干旱成灾的主要原因。
The existence of vulnerability in agricultural drought system is the root that leading drought to disaster.
农业旱灾脆弱性的存在是干旱成灾的主要原因。
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