二轴晶光率体的英文

biaxial indicatrix

indicatrix of optic biaxial crystal

indicatrix of optic diaxial crystal

• 二:    two
• 轴:    axle; shaft
• 晶:    brilliant; glitter ...
• 光:    light; ray
• 率:    rate; ratio; propo ...
• 体:    body; part of the ...