useful是什么意思？

And, perhaps, similar to sails, they make a useful back-up for when the lights go out.

Useful thinking skills for advanced academic research.

Marking a book is a useful skill, but it's important to do it right.

But unlike meditation, craft activities result in tangible and often useful products that can enhance self-esteem.

My notes may or may not be useful, but the point is that by writing down what Mr.Brown says, I can follow his line of thinking more easily.

So you don't think fining people is useful.

They were the pioneers of gender equity, in their useful, adaptable clothing, which was both made for the masses and capable of self-expression.

They provide a useful service, said Flack.

One useful way is to distinguish between three degrees of poverty—extreme poverty,moderate poverty, and relative poverty.

The researchers also acknowledged that there are a few areas where race as a construct might still be useful in scientific research: as a political and social, but not biological, variable.

Racial terms are still useful in certain fields of study.

Michael Yudell, a professor of public health at Drexel University in Philadelphia, said that modern genetics research is operating in a paradox: on the one hand, race is understood to be a useful tool to illuminate human genetic diversity, but on the other hand, race is also understood to be a poorly defined marker of that diversity.

Some of the heat is used directly or produces useful work; the rest is lost or rejected, radiated into the atmosphere from the engines, motors, boilers and all the energy-consuming machinery that makes American’s wheel go around.

According to the Centre for Strategic and International Studies,about three quarter of energy we use to move things, including ourselves, accomplishes no useful work.

Few of us wish to turn the clock back, but perhaps we need to remind ourselves how useful the right obstacles can be.

scientists haven't trained for directly—but for which they have useful knowledge, skills, and experience

Experts see a movement toward the use of mobile technology in education, though they say it is in its infancy as professors try to come up with useful applications.

That "mobile telepresence" could be useful at the office.

I don't attend services when I am there, and I have never meditated, there or anywhere; I just take walks and read and lose myself in the stillness, recalling that it is only by stepping briefly away from my wife and bosses and friends that I will have anything useful to bring to them

Immigration in the developed world is the highest it has ever been, and it is making a useful difference.

They are easily-available on the continent and they are useful if a singer has problems with his vocal cords and has to sing that night.

When they are no longer useful.

"They provide a useful service," said Flack.

Michael Yudell, a professor of public health at Drexel University in Philadelphia, said that modern genetics research is operating in a paradox: on the one hand, race is understood to be a useful tool to illuminate human genetic diversity, but on the othe

Once Farrant and her colleagues feel they have a better sense of which switches to throw, they will have to find the best way to do so in useful crops.

One useful tip is that things are more likely to be remembered if you are in exactly the same state and place as you were when you learned them.

The bureau could easily present their data in more useful ways, but they have chosen not to.

They were the pioneers of gender equity, in their useful, adaptable clothing, which was both made for the masses and capable of self expression.

Unfortunately, that conclusion puts too much weight on a useful, but flawed and incomplete, statistic.