Phase conjugation of backward-and forward-wave produced by degenerate four-wave mixing using a nearly resonantly enhanced nonlinearity in four-level organic dye solutions was investigated.

研究了近共振增强的四能级系统有机染料溶液中简并的四波混频后向反射波及前向波的位相复共轭特性。

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Caterpillars move by a wave that starts at the back end of their body and sweeps through each segment until it reaches the head, pushing it forward.

毛毛虫移动时的每一波都是从身体的后段开始，然后这个波穿过身体的每一部分，一直到达头部，进而将整个身体向前移动。

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John Mitchell, an English physicist and astronomer, was inspired by it to put forward the first theories of wave motion in the earth.

约翰·米切尔，英国物理及天文学家，由此得到灵感并提出了第一个地球内部波动理论。

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Honda's Collision Mitigation Brake System (CMS), for example, uses a forward-looking millimetre-wave radar to scan the road ahead.

ECONOMIST: Cars that drive themselves

With that computational power and the ability to tirelessly swim across vast oceans, the Wave Glider SV3 represents a big step forward in the state-of-the-art of unmanned monitoring and exploration.

ENGADGET: Wave Glider sea robot gets a new version, replete with more power and gear

We think that's the right way for Northern Ireland to go forward but we don't think that we need to wave flags - wrap ourselves in the flag - to provide the leadership that Northern Ireland needs.

BBC: Basil McCrea and John McCallister set up new unionist party