Required Mathematical Intelligence

Chapter 146 The Milk in the Milk Jug
There is a milk jug in front of you, which contains 4 liters of milk. You need to divide the 4 liters of milk between two companions to take home, but you only have two empty milk jugs: one can hold 1.5 liters, and the other Can hold 2.5 liters.Is there any way you can use these 3 milk jugs to divide the 4 liters of milk evenly?At least how many times?
[答案：先将牛奶倒入盛2.5升的，然后将2.5升的倒入1.5升的，然后将1.5升的倒回奶罐里，然后把2.5升里的1升倒入1.5升的，然后将奶罐的奶倒入2.5升的，然后把2.5升的倒入1.5升的，现在2.5升中就是2升了，奶罐和1.5升的加起来是2升。总共到6次]
(End of this chapter)