I think it means that if you are in serious trouble then you can ask for help
it had 2 walls the inner wall and the outer wall.
Is it a curtain wall or a concentric one?
Strange question. Ther was a Berlin wall dividing the city, but it's been torn down quite a few years by now. And not even that one was concentric.
Personally I would make it out of card board. It could include round towers which could be made out of toilet roll. REMEMBER: A concentric castle needs an outer wall and the castle goes in the middle. The outer wall is to give the castle more protection. Try not to make it a fairy-tale castle and more of a historic castle made out of stone.
I think that they were designed so that if the first wall fell to an attacking army they could retreat and make another stand on the second wall
Ventricular hypertrophy means a thickening of the ventricle walls. This can then be described as eccentric or concentric. Eccentric hypertrophy is where the wall thickens but the ventricle itself dilates therefore the wall is thickened but the ventricular chamber remains the same size. Concentric hypertrophy is where the wall thickens which then makes the internal ventricular chamber smaller.
On SQUARE KEEP Castles, they have corners, therefore attackers can dig underneath them, whereas CONCENTRIC CASTLES have one round wall, so this cannot happen.
The outer wall of a castle is called a curtain wall. Inside it is a ward or bailey. Sometimes a castle has a second curtain wall in the ward, providing a second line of defense in case the outer one fails. Such a castle is called a concentric castle. There is a link to an article on concentric castles below.
The word concentrically simply means in a concentric manner. Concentric is a term used to describe spheres of different sizes with a common middle point.
Concentric means having a common center, such as circles within circles where each one shares the same central point.
If you mean they both have the same centre - they're called 'concentric' circles.
Concentric