straggler
  遊蕩者,流浪者,落後者
  Strag·gler n.
  1. One who straggles, or departs from the direct or proper course, or from the company to which he belongs; one who falls behind the rest; one who rambles without any settled direction.
  2. A roving vagabond.
  3. Something that shoots, or spreads out, beyond the rest, or too far; an exuberant growth.
  Let thy hand supply the pruning knife,
  And crop luxuriant stragglers.   --Dryden.
  4. Something that stands alone or by itself.
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  straggler
       n : someone who strays or falls behind [syn: strayer]