我在一个Split/cam内层（power plane)上覆铜时，系统提示下面错误，那位大虾解释一下啊．

THERMAL RELIEF ERRORS REPORT -- previewpour.pcb -- Fri Dec 30 16:17:33 2005

       Drilled pads with                    Nondrilled pads with
less than 50% thermal extensions      less than 50% thermal extensions

Report of Thermal Spokes Generator.

On Power Plane:
        (3625, 995) # = 0
        (2130, 405) # = 0
        (1925, 980) # = 0
Q1.1    (3100, 1200) # = 0
        (1925, 1630) # = 0
        (1080, 1150) # = 0
        (1076.26, 650) # = 0

Total Drilled pads:    7               Total Nondrilled pads:    0