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

这样我们就可以避免在用电高峰期建造昂贵的电厂或购买昂贵的电力。

youdao

Nondisposable products are less expensive in the long term but can be costly to repair.

长期来看，非一次性产品的价格较低，但维修成本较高。

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The zoo said raising the abandoned iguanas was proving costly because of the expensive ultraviolet lights needed by the reptile and because of their healthy appetites.

动物园说，养护这些被遗弃的鬣蜥证明是代价高昂的，因为它们匍匐休息时需要昂贵的紫外线，而且它们胃口又挺大。

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But one thing evident from their research: Such therapeutic cloning could be a very expensive treatment, more costly than even the priciest drugs.

FORBES: Cloning's High Cost

Which is why although they are expensive to build and costly to run, such cultural buildings are seen as an ace in the pack when it comes to urban regeneration.

BBC: The Hepworth: Is our love of modern art here to stay?

For doctors, the more expensive the better, since costly drugs tend to carry higher markups.

FORBES: Bad medicine