key·hole /ˈkiˌhol/
 鍵孔,栓孔,鎖眼(a.)顯示內情的


 Key·hole n.
 1. A hole or apertupe in a door or lock, for receiving a key.
 2. (a) Carp. A hole or excavation in beams intended to be joined together, to receive the key which fastens them. (b) Mach. a mortise for a key or cotter.
 Keyhole limpet Zool., a marine gastropod of the genus Fissurella and allied genera. See Fissurella.
 Keyhole saw, a narrow, slender saw, used in cutting keyholes, etc., as in doors; a kind of compass saw or fret saw.
 Keyhole urchin Zool., any one of numerous clypeastroid sea urchins, of the genera Melitta, Rotula, and Encope; -- so called because they have one or more perforations resembling keyholes.

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 keyhole
      n : the hole where a key is inserted