例句與造句

1. The optimal model of truss structure is established , in which the cross sectional areas of bar are taken as design variables , the structure weight is taken as objective function . in the process , the reliability of structural displacement and bar stress and the fundamental frequency are taken as constraint functions . from the engineering practice , all the reliability constraints , which are implicit generally with the design variables , are equalized and transferred to the conventional explicit constraints
   本文將主要考慮桁架結(jié)構(gòu)的優(yōu)化問(wèn)題，首先建立數(shù)學(xué)模型，即以桁架的橫截面積為設(shè)計(jì)變量、以重量最小為優(yōu)化目標(biāo)，位移、應(yīng)力等可靠性及基頻為約束條件；最后，從工程實(shí)際出發(fā)，對(duì)結(jié)構(gòu)系統(tǒng)的可靠性隱形約束進(jìn)行等價(jià)顯化處理，使之轉(zhuǎn)化為常規(guī)的橫截面積優(yōu)化問(wèn)題。
2. It's difficult to find explicit constraint in a sentence. 用explicit constraint造句挺難的