angles back to back

Back filling at abutment back of Bridge or culvert

back reaming and back transportation

back to back

back to back houses

Back-to-Back

(pressure)gauge with back connection

1-back

a back answer

a back issue

a back number

a back order

a back stationary flat system with suction device

a basket carried on the back

A Dream Back To Qinghe River

a rolling back of human rights and rule of law

a stab in the back

a view of somebody's back

acoustic feed back

across back