masking
  掩蔽
  masking
  遮罩
  Mask, v. t. [imp. & p. p. Masked p. pr. & vb. n. Masking.]
  1. To cover, as the face, by way of concealment or defense against injury; to conceal with a mask or visor.
     They must all be masked and vizarded.   --Shak.
  2. To disguise; to cover; to hide.
     Masking the business from the common eye.   --Shak.
  3. Mil. (a) To conceal; also, to intervene in the line of. (b) To cover or keep in check; as, to mask a body of troops or a fortress by a superior force, while some hostile evolution is being carried out.
  masking
       n 1: the act of concealing the existence of something by
            obstructing the view of it; "the cover concealed their
            guns from enemy aircraft" [syn: cover, covering, screening]
       2: the blocking of one sensation resulting from the presence of
          another sensation; "he studied auditory masking by pure
          tones"
       3: scenery used to block the audience's view of parts of the
          stage that should not be seen [syn: masking piece]