Sealed, air-conditioned buildings and other closed spaces utilizing circulated forced air, like commercial airliners, are also criticized as breeding grounds for communicable diseases.
空调化的封闭建筑及其他象商业客机等使用循环压力送风的封闭空间，也被批评为传染性疾病的滋生地。
2
This paper discusses closed water breeding techniques of eel from the design of the pool, treatment of seed eels and management.
本文主要从鳝池的设计、苗种处理、日常管理等方面探讨了鳝鱼的静水无土养殖技术。
3
Soilless breeding eel can be further divided into running water breeding and closed water breeding.