资料来源 : pyDict

无压载

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Unballast \Un*bal"last\, v. t. [1st pref. un- + ballast.]
   To free from ballast; to discharge ballast from. --Totten.

Unballast \Un*bal"last\, a.
   Not ballasted. [Obs. & R.] --Addison.