一个好的测试方法是虚焦一点点，看图像是不是圆形或者是蛋型的。
A good test is to defocus just a bit and see if the image is nice and round or egg-shaped.
一个近景而虚焦的工人肖像，部分遮挡了在纪念广场附近林立的高楼。 他曾为这个地区的钢铁行业做出贡献，现在已经下岗。
An unemployed man, close and out of focus, partly obscures high-rise buildings being erected around a memorial square, dedicated to the region's iron industry.
本文提出了在高功率CO_2激光器上应用阶梯反射输出的虚共焦非稳腔。
A positive-branch unstable resonator with a step reflectivity mirror used in high power CO_2 laser is presented.
本文提出了在高功率CO_2激光器上应用阶梯反射输出的虚共焦非稳腔。
A positive-branch unstable resonator with a step reflectivity mirror used in high power CO_2 laser is presented.
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