UCI网申GPA是怎么填写呢，求戳！

[size=0.8em]Grade Point Average (on a 4-point scale):*
(Enter the number "0" if not applicable or your school didn't use GPA)

[size=0.8em]Total Cumulative Average Grade (on an alternate grading scale):
(Enter the number "0" if your school used a traditional GPA)

Briefly describe the alternate grading scale (max 100 chars):

应该是如果是4.0 scale的gpa，就上面填gpa下面填0， 如果是其他的scale就上面填0下面填gpa然后简单解释下算gpa的机制这样。。。