There is always field curvature in image of large field optical systems.
大视场光学系统的像面往往存在场曲。
In this fundamental work, curvature and the gravity field of the earth must be considered.
在这项基础工作中，地球的曲率和重力场都应被考虑。
In this fundamental work, curvature and the gravity field of the earth must be considered.
在这项基础工作中，地球的曲率和重力场都应被考虑。
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