But inside, special windows cut power bills by blocking solar heat in summer and retaining indoor warmth in winter.
出自-2013年6月閱讀原文
Indoor pollution, which includes sources like home heating and cooking, has remained constant over the past several decades despite advances in the area.
2018年12月四級真題（第一套）閱讀 Section A
The report includes both indoor and outdoor air pollution.
2018年12月四級真題（第一套）閱讀 Section A
Less than an hour away by snowmobile, Chinese labourers have updated the Great Wall Station, a vital part of China's plan to operate five bases on Antarctica, complete with an indoor badminton court and sleeping quarters for 150 people.
出自-2016年12月閱讀原文
There's a new indoor play centre, plus the special events and workshops, and others during school holiday periods.