costly是什么意思？

It is more costly than what our ancestors ate.

It is becoming costly.

Given the rising investment in college education, parental concern is not surprising, but learning where and when to intervene (干预 ) will help students take more ownership of the outcomes of these increasingly costly educations.

They find it costly to give up their existing assets.

That lets us avoid building costly plants or buying expensive power at peak usage time

living separately would be too costly

Surveys show that the number of worried Americans has been steadily growing over the years as the computer becomes increasingly efficient, easier to operate, and less costly to purchase and maintain.

Some desalination plants exist where feasible, but they are costly to run and can need constant repairs.

Travel was arduous and costly throughout the period, possible only for a privileged class—the same that produced gentlemen scientists, authors, antique experts, and patrons of the arts.

The reason is that when carbon is priced, those emissions reductions that are least costly to implement will happen first.

To change the light source is costly because you have to change the whole fixture.

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

Medicare could save hundreds of millions of dollars a year if everyone used the cheaper drug, Avastin, instead of the costlier one, Lucentis.