例句與造句

1. in practical projects, the boundary shape irregularity of the lake, reservoir, river and estuary area and the non-linear character of hydrodynamic equation make it difficult to get the theoretical solution of the equation, so the numerical solution has to be the only a choice
   由于實(shí)際工程中湖泊、水庫(kù)、河流、河口區(qū)域邊界幾何形狀的不規(guī)則，以及水動(dòng)力學(xué)方程的非線性性質(zhì)，使得理論分析解難以作出，只能求助于數(shù)值解。
2. It's difficult to find shape irregularity in a sentence. 用shape irregularity造句挺難的