'This "stack" is a large chimney or vertical pipe through which combustion gases escape'
a smokestack
A STACK OF KNOWLEDGE: This stack is a large chimney or vertical pipe through which combustion gases escape
This "stack" is a large chimney or vertical pipe through which combustion gases escape
This "stack" is a large chimney or vertical pipe through which combustion gases escape
A STACK OF KNOWLEDGE
a smokestack
A STACK OF KNOWLEDGE