drilling
 演練


 Drill v. t. [imp. & p. p. Drilled p. pr. & vb. n. Drilling.]
 1. To pierce or bore with a drill, or a with a drill; to perforate; as, to drill a hole into a rock; to drill a piece of metal.
 2. To train in the military art; to exercise diligently, as soldiers, in military evolutions and exercises; hence, to instruct thoroughly in the rudiments of any art or branch of knowledge; to discipline.
    He [Frederic the Great] drilled his people, as he drilled his grenadiers.   -- Macaulay.


 Drill·ing, n.
 1. The act of piercing with a drill.
 2. A training by repeated exercises.


 Drill·ing, n. The act of using a drill in sowing seeds.


 Drill·ing, n.  Manuf. A heavy, twilled fabric of linen or cotton.

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 drilling
      n 1: the act of drilling [syn: boring]
      2: the act of drilling a hole in the earth in the hope of
         producing petroleum [syn: boring, oil production]