To put it simply, it is the pure history of campus development between an ostrich with wool tied as lace and a fake socket that seems to be useful but cannot be powered... How can it be said like this! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! In essence, it can be summarized as a pair of BG that everyone sees, BL that the socket thinks, and GL that the lace thinks. The reality is that they really have a history of hooking up with BG.