例句與造句

1. Generally , the skew bridge ' s calculation theories can be divided into three types : the category 1 is the plank theories method , such as the finite difference method , the finite element method and the finite strip method , etc ; the category 2 is the beam theories , such as the grid beam theories , the general grid theories , the rigid cross - beam method , the elastically - supported continuous beam method and the bar system analytical method , etc ; the category 3 is the practical method , such as the g - m revising method , the grid - beam simple method and ghali form coefficient method , etc
   目前關(guān)于斜梁橋的計算理論和方法概括起來，大致可以分為三類：第一類為板理論方法，如有限差分法、變分法、有限單元法、有限條法等；第二類為梁理論法，如格構(gòu)梁理論、一般格構(gòu)理論、剛性橫梁法、彈性支承連續(xù)法、桿件結(jié)構(gòu)的分析方法；第三類為實(shí)用計算法，荷載橫向分布的計算方法如g ? m修正法、格構(gòu)梁的簡易法、 ghali表格系數(shù)法等。
2. It's difficult to find rigid crossing in a sentence. 用rigid crossing造句挺難的