gliding
 (a.)流暢的,滑順的,滑行的
 Glide, v. i. [imp. & p. p. Glided; p. pr. & vb. n. Gliding.]
 1. To move gently and smoothly; to pass along without noise, violence, or apparent effort; to pass rapidly and easily, or with a smooth, silent motion, as a river in its channel, a bird in the air, a skater over ice.
    The river glideth at his own sweet will.   --Wordsworth.
 2. Phon. To pass with a glide, as the voice.
 3. Aëronautics To move through the air by virtue of gravity or momentum; to volplane.
 gliding
      n : the activity of flying a glider [syn: glide, sailplaning,
           soaring, sailing]