crenel

基本解釋

The Mutian Valley Great Wall's construction has the unique style, here watch tower is crowded, the mountain pass is important, the city both sides have the crenel.
慕田峪長城的構筑有著獨特的風格，這里敵樓密集，關隘險要，城兩側均有垛口。
The city is square, the fence is 12 meters or so high, build by laying bricks or stones of outside and total brick, build on the wall have crenel, there is moat outside the wall.
城為方形,墻高12米左右,外表全部磚砌,墻上筑有垛口,墻外有護城河。
Low is called the bench table, highly with city wall difference not many, but outside the prominent wall, all around has the crenel, is place which the patrol stands sentry.
低的叫墻臺，高度與城墻相差不多但突出墻外，四周有垛口，是巡邏放哨的地方。

any of a set of openings formed in the top of a wall or parapet and having slanting sides, as in a battlement