求翻译：亚历山大城附近法罗斯岛防波堤南端 灯塔高达120米，分4层。第一层是方形，高69米；第二层为八角形墙，高38米；第三层是圆塔，像个堡垒；第四层塔顶，放有一只大火盆，熊熊火焰日夜不熄，后面有一块磨得光光的花岗石做的反光镜，使在远处航行的船只也能看到。塔内共有房间近300间。塔身用白色大理石砌筑，石缝之间用熔化的铝弥合。塔基则用能耐海水腐蚀的玻璃块填实。是什么意思？

Alexandria Pharos Island breakwater near the southern tip of the lighthouse up to 120 meters, divided into four layers. The first layer is a square, 69 meters high; The second tier is octagonal wall, 38 meters high; the third layer is the round tower, like a fortress; the fourth floor of the tower,

Alexander Ross Island near the town law breakwater lighthouse South End up to 120M, 4-storey. The first tier is square, and 69 meters high; the layer 2 to 8 triangle wall, 38 m high; the layer 3 is a round tower, just like a fortress; the first 4 layers, the top of the tower there is a large fire, d

Alexandria near the southern tip of Pharos breakwater Lighthouse is 120 meters high, 4. The first layer is the square, 69 meters high; second-tier octagonal walls, 38 meters high; the third layer is the round tower, like a fortress; the fourth floor Tower, there is a fire, put out fires not day and