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The jet composition of gamma-ray bursts (GRBs), as well as how efficientlythe jet converts its energy to radiation, are long-standing problems in GRBphysics. Here, we reported a comprehensive temporal and spectral analysis ofthe TeV-emitting bright GRB 190114C. Its high fluence ($\sim$4.436$\times$10$^{-4}$ erg cm$^{-2}$) allows us to conduct the time-resolvedspectral analysis in great detail and study their variations down to a veryshort time-scale ($\sim$0.1 s) while preserving a high significance. Its promptemission consists of three well-separated pulses. The first two main pulses($P_1$ and $P_2$) exhibit independently strong thermal components, and startingfrom the third pulse ($P_3$) and extending to the entire afterglow, the spectraare all non-thermal, the synchrotron plus Compton up-scattering model wellinterpret the observation. By combining the thermal ($P_1$ and $P_2$) and thenon-thermal ($P_3$) observations based on two different scenarios (global andpulse properties) and following the method described in \cite{Zhang2021}, wemeasure the fireball parameters and GRB radiative efficiency with littleuncertainties for this GRB. A relevantly high GRB radiative efficiency isobtained based on both the global and pulse properties, suggesting that if GRBsare powered by fireballs, the efficiency can be high sometimes. Moreinterestingly, though the observed parameters are individually different (e.g.,the amount of mass loading $M$), the radiative efficiency obtained from $P_1$($\eta_\gamma=36.0\pm6.5\%$) and $P_2$ ($\eta_\gamma=41.1\pm1.9\%$) is roughlythe same, which implies that the central engine of the same GRB has some commonproperties.

GRB 190114C: Fireball Energy Budget and Radiative Efficiency Revisited