77 (A)A點之穿透率較高，為interleaf transmission, tongue and groove effect可發生於此處 (B)A點之穿透率較高，為midleaf transmission, tongue and groove effect可發生於此處 (C)B點之穿透率較低，為interleaf transmission, tongue and groove effect可發生於此處 (D)B點之穿透率較低，為midleaf transmission, tongue and groove effect可發生於此處