食管扩张管
esophageal expanding tube
WDM网状网
WDM mesh networks
WDM mesh network
wavelength division multiplexing mesh networks
本地交换网网管
Local switching network management
本地网网管系统
local network management system
低压环状管网
low-pressure circular pipe network
方向性资源网状网
mesh networks with directional capacity
供水管网管理
water supply pipe management