还指出仅当柱面或平面光栅时，才能形成二阶子午无离焦平场和弧矢无象散圆场谱面。
It is also shown that only when the gratings are cylinder or plane ones, the second order sagittal anastigmatic circular field and meridional non defocus flat field spectral images can be formed.
当机遇在火星的一个叫子午线平面上降落的时候，它偶然发现地质学上看起来像是水的产物让人很着急。
When Opportunity touched down on a part of Mars called Meridiani Planum, it came across geology that looked tantalizingly like the product of standing water.
当机遇在火星的一个叫子午线平面上降落的时候，它偶然发现地质学上看起来像是水的产物让人很着急。
When Opportunity touched down on a part of Mars called Meridiani Planum, it came across geology that looked tantalizingly like the product of standing water.
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