The length, width, and height of a cuboid are a, b, and h respectively. If its height is increased by 3 cm, how many cubic centimeters will the volume of the new cuboid increase compared to the original?
一个长方体的长、宽、高分别a、b、h，如果它的高增加3厘米后，新的长方体体积比原来增加多少立方厘米？
<result>3</result>