例句與造句

1. Where ? r0 is the intrinsic carrier radiative lifetime of the bulk material, a is the differential gain, v g is the group velocity, ? p = Q / ? L is the photon lifetime, ? L is the lasing frequency, ? is the spontaneous emission coupling factor which is enhanced by the Purcell effect, and 1 / ? total = F / ? r0 + 1 / ? nr where ? nr is the non-radiative lifetime.
2. It's difficult to find photon lifetime in a sentence. 用photon lifetime造句挺難的