Top Circuit: 正面线路层
Internal: PCB 内层
Neg plane: PCB +负片
POS plane: PCB +正片
Bottom: 反面线路层
Border:PBC 边缘
Silk top:正面丝印层
Silk bot:反面丝印层
Mask top:正面防焊层
Mask bot:反面防焊层
Refdes top:正面元件层
Refdes bot:反面元件层
Temporary:临时层
Insulator:内部绝缘层
Paste top:正面焊盘层
Paste bot:反面焊盘层
Nc Primary:(plated drill layer?)
Nc Secondary:(un plated drill layer?)
Good luck for you!!!