通过扫描头前方聚焦透镜的反射单元，调焦发生了变化。
The focusing is effected after the deflection unit via a focusing lens in front of the scanner head.
概述了近年来用近垂直反射地震方法研究不同大地构造单元的地壳结构和深部构造问题所取得的基本成果。
The paper summarizes the basic achievement in studying the crustal structure and deep tectonics of different geotectonic unit by near normal seismic reflection in recent years.
每一个耳机单元的外侧是“百叶窗式背板系统”，用来保护单元并减少向振膜的声音反射。
The outside of each earpiece has a "Window Shade Grill System" that protects the driver and minimizes sound refraction coming back in against the diaphragm.
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