有什么语法错误 The particle flow code (PFC) proposed by Cundall et al. [25] in the 1970s based on the discrete element method.
The sentence is grammatically correct, but it could be improved by adding a verb to make it a complete sentence. Here's one way to do so:
"The particle flow code (PFC), which was proposed by Cundall et al. [25] in the 1970s, is based on the discrete element method."
![有什么语法错误
The particle flow code (PFC) proposed by Cundall et al. [25] in the 1970s based on the discrete element method.](http://copyright.bdstatic.com/vcg/creative/14b472185c0fb9ac1fd62ce69ffe3c3d.jpg "有什么语法错误
The particle flow code (PFC) proposed by Cundall et al. [25] in the 1970s based on the discrete element method.")
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