广播电视英语短句 第 208 课：室内空气污染-5

They are said to use forty to fifty percent less wood than an open fire, and produce fifty to seventy-five percent less smoke. 据说比自由打火式的炉子要少用 40% 到 50% 的木材，并且少产生 50% 到 75% 的烟。

A company called StoveTec is selling them through its Web site for less than ten dollars. 一家叫做 StoveTec 的公司正在通过他们的网站销售炉子，价格低于 10 美金。

Dean Still says that more than one hundred thousand have been sold so far. Dean Still 说目前该公司已经销售了超过 10 万款这种的炉子。