They are said to use forty to fifty percent less wood than an open fire, and produce fifty to seventy-five percent less smoke.

VOA: special.2010.02.01

I did it myself using my data, but it would always look more or less like this-- slightly different positions if people use different estimates.

这幅图是我根据自己的数据画出来的，有效边界的图形大致就是如此-,随着人们采用不同的估计值,其位置会发生微小的变化。

耶鲁公开课 - 金融市场课程节选

that could make them less desirable. Asian-Americans are not the only ones who use ginseng.

VOA: special.2009.04.07

He says a less costly, easy-to-use medicine for sleeping sickness is badly needed.

VOA: special.2010.04.07

"We say,find more American energy and use less--energy that is as clean as possible, as reliable as possible, and at as low a cost as possible.

VOA: standard.2009.04.25

And farmers planting glyphosate-resistant crops can use just one less-toxic herbicide to control weeds.

VOA: standard.2010.04.15