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The tunability of millimeter wave free electron laser was observed.
观察到了毫米波自由电子激光器的调谐特性。
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In optics, scientists look for atomically smooth and wave-free surfaces.
在光学上，科学家们在寻求原子级上光滑和无波的表面。
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In optics, scientists look for atomically smooth and wave-free surfaces.
在光学上，科学家们在寻求原子级上光滑和无波的表面。
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