wel·kin /ˈwɛlkən/
 天空
 Wel·kin n.  The visible regions of the air; the vault of heaven; the sky.
    On the welkne shoon the sterres lyght.   --Chaucer.
    The fair welkin foully overcast.   --Spenser.
    When storms the welkin rend.   --Wordsworth.
 Note: ☞ Used adjectively by Shakespeare in the phase, “Your welkin eye,” with uncertain meaning.
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 welkin
      n : the apparent surface of the imaginary sphere on which
          celestial bodies appear to be projected [syn: celestial
          sphere, sphere, empyrean, firmament, heavens, vault
          of heaven]