Used, must be placed in a clean space.

使用时，必须放置在洁净的空间。

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Have a clean space, with your crystal stones that will assist you.

有干净的空间，带着将会协助你的水晶石头。

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A clean space simulator specifically used for radiant cooler was developed in our institute.

研制了一台空间辐射制冷器热模拟试验专用的清洁无油环境模拟设备。

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Tech Nation is a reader friendly explanation of the stakes playing out in the clean tech space.

FORBES: Clean Tech Nation: The Scramble for Clean Tech Supremacy

The experts also stated that the international community needed to sort through the myriad legal issues that would currently frustrate attempts to clean up space.

BBC: 'Urgent need' to remove space debris

There are lots of ideas out there to clean up space.

BBC: Space debris: Time to clean up the sky