An overview of the research conducted in the area of linear and nonlinear vibrations in the turning-point frequency range of loudspeakers and revolution shells is given in chapter 1.
第1章回顾了扬声器和旋转薄壳在转点频段的线性和非线性振动，发现旋转薄壳转点问题中尚有若干问题有待进一步研究。
Once mounted, the closer focusing range is attained by turning the lens to it's closest normal focusing point.
一旦装上它后，只要将镜头转到普通的最近对焦距离处，就可获得更近的对焦。
Once mounted, the closer focusing range is attained by turning the lens to it's closest normal focusing point.
一旦装上它后，只要将镜头转到普通的最近对焦距离处，就可获得更近的对焦。
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