The latest congressional report acknowledges the critical importance of technical training, but also asserts that the study of the humanities (人文學(xué)科)and social sciences must remain central components of America's educational system at all levels.

That notion is not concrete enough and it blurs two key components of hope,' Doctor Snyder said, 'Having hope means believing you have both the will and the way to accomplish your goals, whatever they may be.

And he has a theory of love that argues that it's made up of three components: intimacy,passion and commitment, or what is sometimes called decision commitment.

Electronics giants like Best Buy and Samsung have provided e-waste take-back programs over the past few years, which aim to refurbish (翻新) old electronic components and parts into new products.

Now, we don't want to leave you with the impression that these three components always work together perfectly.

Some 55% of consumers, according to the report, said they are "more concerned about where high-tech components come from than where the product was assembled.

The major components of our energy systems, such as fuel production, refining, electrical generation and distribution, are costly installation that have lengthy life spans.

They hope to reduce both the number of components needed in a construction job and their weight一by replacing solid supports with hollow tubes, for example.

This description of roller-skating?illustrates the three components of an attitude: affect, cognition, and behavior.