There are two walls in eduation. One is visible walls of the builiding seperating the school from real lives; the other is invisible walls between disciplines.

It has 2 walls: the inner and the outer. ______ these walls, there is a vacuum to keep the liquid at a constant temperature.

These walls ___ stone.

文献:Clay-chitosan nanobrick walls

Which of the following is a steel structure building? (There is only one correct answer to this question) A: The building, beams and columns are reinforced concrete, the roof and walls are profiled steel plate B: The building, beams and columns are hot rolled steel, walls are masonry block C: The building, beams and columns are timber, walls are masonry block D: The building, beams and columns are bamboo, walls are masonry block

Our ancestors liked to build walls in order to_____.

Masonry walls become unstable at relatively small heights.( )

The room is typically simple and ________, with white walls and a tiled floor.

In Robert Frost’s “Mending Walls”, wall ...tive meanings of it?

‌The walls of ancient Chinese architecture bear most weight of the house.‏‌‏