adj.secret and sly or sordid

"backstairs gossip"; "his low backstairs cunning"; "backstairs intimacies"

同義詞：backstairsfurtive

Distribution of Bronze in Shanxi Province and Its Crime Trend
Pool stair forms and methods of forming stairs
Safety brake for stairlifts
You may decide on which activities to complete. Make sure your activities total
A statistical summary of mall-based stair-climbing interventions
Hand Gesture Symmetric Behavior Detection and Analysis in Natural Conversation
Decreased task duration and unchanged trunk muscle activity in low-back pain patients during stair climbing after back extensor musc...
19) The useful background of stair-climbing exercises in patients with hemiplegia.
Powered ankle-foot prosthesis to assist level-ground and stair-descent gaits
Training effects of accumulated daily stair-climbing exercise in previously sedentary young women