例句與造句

1. The comparison showed that : ( l ) farassat 1a formula is the simplest one and work well for the subsonic rotor . ( 2 ) both kirchhoff formula and k - fwh formula can predict the nonlinear noise generated by transonic rotor ; ( 3 ) when the surface is not positioned in the linear region , kirchhoff approach for rotating integration surface could lead to substantial error , but k - fwh formula can still work well
   數(shù)值研究表明： farassat1a公式在預(yù)測線性噪聲方面簡單有效，適用于亞音速旋翼的噪聲預(yù)測； kirchhoff公式和k - fwh公式均能夠預(yù)測跨音速旋翼聲場，并且具有較高的精度；當(dāng)聲源面位于流動(dòng)非線性時(shí)， kirchhoff公式會(huì)導(dǎo)致很大的計(jì)算誤差，而k - fwh公式不存在這樣的問題。
2. It's difficult to find kirchhoff formula in a sentence. 用kirchhoff formula造句挺難的