a left-handed material的用法和样例：
- Investigated were the surface modes propagating along a hollow dielectric slab waveguide with a left handed material(LHM) substrate or cover,respectively.
- "You are not quite such a fool as you look", is a left handed compliment.
- A friendless man is like a left hand without a right hand.
- You'll pair up with a left hander in the doubles.
- Generation Fermat's principle into left handed materials[J].