VOA慢速英语:Breathing Easier: The Art of Stove Making

例句：This factory manufactures indoor textile wallcovering.
      这家工厂制造室内布质墙面装饰。

室外的：outdoor

例句：It is important to health to have outdoor activities.
      户外活动对健康很重要。

open air

例句：This open-air terrace is really spacious.
      这露台很宽敞。

2.biomass n.生物量

3.costly a.昂贵的,豪华的,价值高的

例句：Young drivers face costly car insurance.
      年轻的司机们要面对昂贵的车险。

      Language barriers cause costly delays in some courts.
      语言障碍会引起一些法庭休庭，以免造成重大损失。

4.estimate v.估计,估价;评价,判断

例句：The medicare cost is estimated to be one billion dollars.
      老年医疗保健费用估计为十亿美元。

名词形式：estimate n.估价,估价

例句：I'll give you a rough estimate of the costs.
      我给你大致估计一下费用。

5.countless a.数不尽的,无数的

例句：They weary of countless restrictions and fetters.
      他们对种种清规戒律感到很厌烦。

6.inexpensive a.便宜的,不贵重的

例句：I come to the store frequently for its inexpensive commodities.
      这家商店很便宜，我经常去。

7.diminish v.(使)减少,(使)变小

例句：The medical expenses diminished his savings.
      医疗费耗去了他的积蓄。

8.ongoing a.前进的,进行的

例句：Our success demands an ongoing pursuit of perfection.
      我们在追求尽善尽美的过程中不断取得了卓越的成就。