例句與造句

1. where k _ B is the Boltzmann constant, \ hbar is the reduced Planck constant, N _ v is the number of degenerated valleys for the band, C _ l is the average longitudinal elastic moduli, m _ l ^ * is the inertial effective mass, \ Xi is the deformation potential coefficient, \ kappa _ L is the lattice thermal conduction, and T is temperature.
2. It's difficult to find lattice thermal conduction in a sentence. 用lattice thermal conduction造句挺難的