To prevent floating away into space, humans on Mars have to wear special boots to make themselves heavier.

为了阻止飘浮到太空中，火星上的人得穿特殊的鞋子来使他们重一些。

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His staff show people how to make floating garden and fish ponds to prevent starvation during wet season.

他的手下教人们建造浮动花园和鱼塘，以防雨季人们遭受饥饿。

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It is necessary to create a floating shoulder piece to provide stability in the shoulder area and prevent demarcation on the fabric.

为了使肩部稳定并防止在面料上出现分界线，有必要做一个浮动的肩垫。

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"And yet, some folks back in Washington are already floating the idea that they may use political stunts to prevent votes on any of these reforms, " Mr. Obama said on Monday without mentioning that the "folks" who oppose his bill are Democrats.

WSJ: Review & Outlook: The GOP's Gun Control Misfire

And yet, there are already some senators back in Washington floating the idea that they might use obscure procedural stunts to prevent or delay any of these votes on reform.

WHITEHOUSE: President Obama Speaks on Reducing Gun Violence