into paper既current 或者 magnetic field..
咁我隻中指/食指應該點擺呀!?指向下面定前面!?
同埋呢..如果拇指指去天花板,,咁個force係out of paper定upward架!?
我分唔到out of paper 同 upward / into paper同do ...
小霞的fans 發表於 1/12/2009 16:07
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