例句與造句

1. Under the condition of unchanged topology configuration of the truss , the extremum existence of the natural frequency is demonstrated . it will orientate the optimization of structural cross - sections and the topology optimum with frequency constraints toward a further search measure . 4
   證明了在保持結(jié)構(gòu)拓?fù)浠静蛔兊那闆r下，桁架結(jié)構(gòu)優(yōu)化頻率的極值存在，為具有頻率約束的結(jié)構(gòu)的橫截面積優(yōu)化以及進(jìn)一步的拓?fù)鋬?yōu)化提供了優(yōu)化指向； 4
2. The results show that the difference of the properties between the two tv towers is great , and the influences of the structural high order modes as well as the structural cross spectral density on the internal force are obviously , so that this effects on structural internal force must be taken into account comprehensively in the aseismic design of tall tv tower
   結(jié)果表明，洛陽電視塔與東方明珠電視塔的內(nèi)力演變譜密度特性具有很大的差別，結(jié)構(gòu)的高階振型及結(jié)構(gòu)的互譜密度對(duì)結(jié)構(gòu)的內(nèi)力具有較大的影響，因此結(jié)構(gòu)的抗震設(shè)計(jì)應(yīng)綜合考慮這些因素對(duì)結(jié)構(gòu)內(nèi)力的影響效應(yīng)。
3. It's difficult to find structural crossing in a sentence. 用structural crossing造句挺難的