Structural color in nature have inspired people to design and produce optical parts of an apparatus, which provided us with lively stencil.
生物结构色激发了人们设计生产光学器件的灵感，为人们提供了鲜活的模版。
2
The paper analyzed the main electric equipment of HVAC (Heating, Ventilation and Air Conditioning) apparatus and introduced structural principle of the auxiliary power system for EMUs.