Students often travel hundreds of miles to get here.学生常常赶数百英里的路来到这里。If a baby is thirsty, it feeds more often.婴儿要是渴了，就会吃得更频繁。All too often they become enmeshed in deadening routines.他们时常陷入枯燥的日常事务之中。...
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....
比色法涉及氟离子对预先形成的颜色的消色作用.The colorimetric methods involve the bleaching of a preformed color by the fluoride ion.用香草醛-冰醋酸比色法测定西洋参中总皂甙的含量.The content of ginsenoside in Panax quinquefolium L was determined by colorimetry.方法: ...