The dam backs up a large lake.
大坝将水堵住而成一个大湖。
There we saw a huge dam backing up the lake.
那儿，我们看见一座巨型拦湖大坝。
There we saw a huge dam backing up the lake.
在那儿我们看见一座巨型拦湖水坝。
When the dam is completed, it will back up a large lake.
大坝建成后会将水堵住形成一个大湖。
The dam backs up the water to prevent flood.
大坝拦住水以防其泛滥。
The dam backs up the water to prevent flood.
大坝拦住水以防其泛滥。
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