The flux density distributions on focus plane and many defocusing planes are measured by the measurement equipment and focusing characteristics of the spots on each plane are also analyzed.

利用测量装置对焦平面和多个离焦面内的能流密度分布进行测量，并分析每个面内的聚焦光斑特性。

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Nobody turned when we arrived. They stood facing the runway, as though focusing their collective energy upon the airport building, willing the plane to come.

我们到达时人群中没有人回过头来看，他们面朝跑道站着，似乎把意念集中在机场的站屋上，期盼着飞机的到来。

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The laser beam passing through the focusing systems gets an facula, which consists of main spot and sidelobe on the focus plane.

由于光的衍射作用，使通过聚焦系统的激光束入射到特定靶面成一光斑（主光斑） ，而在主光斑以外还有次级光斑圈（旁瓣）。

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Distractions, such as having someone to talk to on the plane or focusing on an engrossing book, can also work to ease the tension.

CNN: Seeing crash reports can worsen flying phobia

Such a partnership could see big cost savings for the carrier, by herding short-haul passengers into trains and focusing on more profitable long-haul plane trips.

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Additionally, it features a macro switching ring on the lens barrel which instantly shortens the minimum focusing distance to approximately 20cm (from image plane), allowing the camera to capture small, close-up subjects with exquisite detail.

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