1. 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. 慕田峪长城的构筑有着独特的风格，这里敌楼密集，关隘险要，城两侧均有垛口。
2. 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. 低的叫墙台，高度与城墙 相差不多但突出墙外，四周有垛口，是巡逻放哨的地方。
英英解释
n.
1. one of a series of rounded projections (or the notches between them) formed by curves along an edge
2. a notch or open space between two merlons in a crenelated battlement v.
1. supply with battlements
