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underwater

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Constructed in around 1700, it's nine storeys deep, with the last two levels underwater.(它建于1700年左右，有9层楼深，最后两层在水下。)
Underwater cities will provide more space.(水下城市将提供更多的空间。)
Whales carefully conserve their oxygen when underwater in a couple of ways.(鲸鱼在水下以几种方式小心地保存它们的氧气。)
Astronauts practice spacewalks underwater in a huge special swimming pool.(宇航员在一个巨大的、特别的游泳池里进行水下太空行走的练习。)
But underwater film-making wasn't that unusual, was it?(但水下拍摄电影也没有如此不寻常，不是吗？)
Underwater exploration is so much cheaper than space flight.(水下探索比太空飞行便宜多了。)
That hurts the ancient wooden poles holding up the city underwater.(这破坏了水下支撑这座城市的古老木杆。)
If the water's cloudy like that, it'll be hard to see anyone underwater.(如果水浑浊成那样，就很难看得到水下的人。)
Was he like an innovator with underwater photography too?(他在水下摄影方面也是一个类似于革新者的存在吗？)
Seals breathe air, but that doesn't stop some of them from sleeping underwater.(海豹呼吸空气，但这并不能阻止它们在水下睡觉。)

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