sidelines

n.

a line that marks the side boundary of a playing field

同义词：out of bounds

an auxiliary line of merchandise

an auxiliary activity

同义词：avocationby-linehobbypursuitspare-time activity

Sidelines
PTP1B: from the sidelines to the front lines!
Sidelines: An Algorithm for Increasing Diversity in News and Opinion Aggregators
Bringing disability off the sidelines: a call for papers
From the sidelines: coaching as a nurse practitioner strategy for improving health outcomes.
Women on the Sidelines: Women's Representation on Committees in Latin American Legislatures
Similarity on sports sidelines: How mentor-protégé sex similarity affects mentoring.
Guidelines: making the headlines or confined to the sidelines?
Why Has Income Inequality Remained on the Sidelines of Public Policy for So Long?
Seeking health care information: most consumers still on the sidelines.