I know it's nothing serious and I feel quite unemotional about it.我知道那根本没什么大不了的，所以有些无动于衷。We all know that fats spoil by becoming rancid.我们都知道油脂变质后会发臭。Kaspar had spoken know-ledgeably about the state of agriculture i...
入射角等于反射角.The angle of incidence equals the angle of reflection.冬季小入射角阳光的透射可以增加室内亮度.Low - angle winter sunlight penetration can give rise to glare.这种情况中的入射角是三十度.The incident angle in this case is 30 degree....