先前的一张焦距短，第二张他用了长焦。
For the first shot he used a shorter focal length and the second shot he used a longer one.
第一单弯曲反射面有一个焦距大于表面的第二个单弯反射。
The first single-curved reflective surface has a focal length greater than that of the second single-curved reflective surface.
第一单弯曲反射面有一个焦距大于表面的第二个单弯反射。
The first single-curved reflective surface has a focal length greater than that of the second single-curved reflective surface.
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