atprep.在；向；达n.基普(老挝货币基本单位)(=att)；[化]砹(极不稳定放射性元素)abbr.密封的(=airtight)abbr.气温(=air temperature)Attaan阿坦

1. The contribution to thermal stability of an optical system made by the thermal expansion of lens housing must be considered in the design of an athermal space optical system.
   在空间光学系统无热化设计时，需要考虑机械结构的热性能对系统热稳定性的贡献。