It is difficult to build a dam in the sea, and the cost is very high.

在海里建水坝十分困难，成本也很高。

youdao

Environmental groups now have a very good chance of forcing the removal of two major dams, the Glen Canyon Dam on the Colorado and the Hetch Hetchy Dam in Yosemite.

环保组织现在很可能会强制拆除掉两座重要大坝——科罗拉多的格伦峡谷大坝和约塞米蒂的赫奇赫奇大坝。

youdao

For example, you could put a dam in the middle of the tank.

举个例子，在水槽中间放个屏障。

youdao

At the time, it was the largest and tallest dam in the world.

VOA: special.2009.03.04

For example, you could put a dam in the middle of the tank.

举个例子,在水槽中间放个屏障。

麻省理工公开课 - 固态化学导论课程节选

As you can see, I work here in the Macombs Dam Park where the track is at.

正如你所看到的，我在这里的梅可姆公园工作，那条小路就在那儿。

在梅可姆公园 - SpeakingMax英语口语达人

Or take the Aswan High Dam in Egypt, an unmitigated disaster, according to ecologists.

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The most notable casualty is the massive hydro-electric Bakun Dam in East Malaysia's Sarawak state.

CNN: Mahathir's Worldly Concerns

But when it comes to the monstrous Belo Monte dam in Para state, what else is new?

FORBES: Amazon Natives Shut Down Brazil's 'Pandora Dam'