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

   {Triple-expansion steam engine}, a compound steam engine in
      which the same steam performs work in three cylinders
      successively.

   {Triple measure} (Mus.), a measure of tree beats of which
      first only is accented.

   {Triple ratio} (Math.), a ratio which is equal to 3.

   {Triple salt} (Chem.), a salt containing three distinct basic
      atoms as radicals; thus, microcosmic salt is a triple
      salt.

   {Triple star} (Astron.), a system of three stars in close
      proximity.

   {Triple time} (Mus.), that time in which each measure is
      divided into three equal parts.

   {Triple valve}, in an automatic air brake for railroad cars,
      the valve under each car, by means of which the brake is
      controlled by a change of pressure in the air pipe leading
      from the locomotive.