playpen

n.

（供幼儿在内玩耍的）护栏；

复数：playpens

Playpen
Playpen
Playpen
Portable playpen
Joint of a playpen
Playground or Playpen
Playpen having facility for coaxing infant
Folding playpen with attached fabric enclosure
Hinge device for armrails of a playpen
Bendable joint for a collapsible playpen
From the playpen to the bombsite: the changing nature of management science
Women Leaving the Playpen: The Emancipating Role of Female Suffrage
Designing digital experiences for positive youth development: from playpen to playground