unshadowed造句

• High - powered technology of tricolor fluorescent powder and trioxide aluminum envelope mix powder make the products effective , durable , high luminosity , long life , unshadowed , no black head phenomena , good color rendering and less eyestrain
  灯管采用高性能的三基色荧光粉及三氧化铝包膜配粉技术，光效高，寿命长，无暗区，无黑头现象，显色性好，保护视力。