雅思考官录PTE 口语机经  9

雅思考官录PTE 口语机经 9

2017-10-08    00'23''

主播: 海外东方学院

526 45

介绍:
Modern buildings have to achieve certain performance requirements, at least to satisfy those of building codes, to provide a safe, healthy and comfortable environment. However, these conditioned environments demand resources in energy and materials, which are both limited in supply, to build and operate.