With interest rates so close to zero, Banks are having to cut their lending rates but have no room to drop their deposit rates further. Spreads compress as a result.

当利率接近零的时候，银行不得不削减贷款利率但是也没有再降低存款利率的余地，致使了收益差的压缩。

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Unlike a conventional jet engine that uses a rotating compressor to compress air into the engine for combustion , this one has no moving parts.

传统的喷气式引擎利用旋转压气机将空气压缩进入引擎来燃烧，而这架飞机却完全没有运动的部分。

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Unlike gases, liquids are difficult to compress because there is practically no free space between molecules.

液体不像气体，它难以压缩，因为实际上分子之间并没有空间。

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"There's no air in space to compress to ring against your ear, " she told CNN in an interview at the TED conference in Long Beach, California, in March.

CNN: Cosmic music from dying stars

The barrier to using the devices in vehicles is no one knows how to carry enough hydrogen, a light and flammable gas that is difficult to compress, to be useful.

CNN: Bus showcases fuel cell technology