The utility model has the advantages of simple structure, convenient use and tight meshing among layers; the utility model can prevent the leakage of the water.
本实用新型结构简单，使用方便，层间咬合紧密，可防止水的渗漏。
2
The structure adopts gradual decompression technology and built-in drainage system, which ensures a satisfactory water-tight and air-tight performance.
结构采用逐渐减压原理，内设排水系统，防雨水渗漏和防空气渗透性能良好。
3
Such tight multilayer structure is to protect the fiber to prevent fracture and to prevent the intrusion of sea water.