短语词组短语pipe and trench 工艺管沟accessible pipe trench 进入管沟common pipe trench 共同管沟indoor pipe trench 室内管沟outdoor pipe trench 室外管沟cable and pipe trench 电缆和管道沟pipe laid down into trench 沉管下沟trench type pipe 沟槽式管件 返回 pipe trench