- actual system
- 实际: reality; practice
- 的: 4次方是 The fourth power of 2 i ...
- 系统: system
- 实际的光学系统: practical optical system
- 实际的: 42) practical; actual; aktuell; down-to-earth; effective; effectual; nononsense; physical; positive; practicable; practical―practically; pragmatical; praktisch adj; real; tangible; true; verier; virtual; visible
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