It would also need good shielding and special electronics to filter the DSSS signal from the radio-noise created by the Earth, the sun and the rest of the galaxy.

同时还需要良好的外层保护和特殊电子器件，从地球、太阳及其太空中传来的无线电“杂音”中过滤出dsss信号。

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IceCube takes advantage of neutrinos' slipperiness, using Earth as a filter of more interactive particles.

冰立方利用了中微子的滑溜，将地球作为一个对更容易发生相互作用的粒子的过滤器。

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Rainforests have been called the "lungs of the Earth," because they filter our air by absorbing CO2, while emitting life-supporting oxygen.

雨林被称为地球的“肺”，因为它们过滤空气吸收二氧化碳，而排放维持生命的氧气。

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It acts as a sunlight filter, shielding life on Earth from harmful ultraviolet rays that put humans at greater risk of skin cancer and cataracts and harm marine life, the agency said.

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Some scientists, giving their imaginations free rein (and extrapolating from Earth's own sea creatures), have suggested filter-feeders, such as whales.

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Like the astronauts aboard Apollo 13 who had to build a CO2 filter from whatever was available in their capsule under the direction of engineers back on Earth, we are forced to innovate in real time.

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