If only one chopstick, but why eat lotus root, then the most convenient is to chopsticks pointed to the coupling piece to wear to provoke eat the Yan Kong.

Coupling piece for joining two containers that are stacked one atop the other, arrangement of stacked containers, and method for joining stacked containers using coupling pieces of this type.

This piezoelectric ceramic piece is composed of two kinds of different materials, there exits coupling question of degree of freedom, and the coupling of different physical field.