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1. Oxford Dictionary

   main beam

   • n.
     a principal beam which transmits a load directly to a column.；the brightest setting of a vehicle's headlights; full beam

   • noun: main beam, plural noun: main beams

2. • 釋義

   n.

   名詞

   • 1. a principal beam which transmits a load directly to a column.
   • 2. British the brightest setting of a vehicle's headlights; full beam headlights were good, particularly on main beam