例句與造句

1. Actually , n - s equation has three unknown functions u , v , p and three equations , now prandtl boundary layer equation has two unknown functions w , vand two equations only , and viscosity terms has partly reduced
   原來(lái)有三個(gè)未知函u ， v ， p及三個(gè)方程，現(xiàn)在只有兩個(gè)未知函數(shù)u ， v及兩個(gè)方程，且粘性項(xiàng)也少了一些，這些都是簡(jiǎn)化的地方。
2. It's difficult to find vand in a sentence. 用vand造句挺難的