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Focal depth of laser beam is advanced by diffraction optical element in this paper.
本文使用衍射光学元件来提高激光束的焦深。
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The local horizontal dislocation reaches about 4 km in the medium at the focal depth, where the upper mantle rises.
在震源深度附近的介质中，局部水平错动可达4公里左右，上地幔顶部在此隆起。
There is too little focal depth in staring at a mirror.
CNN: Te'o tale a mirror to our gullibility?
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