Oblonsky gave a scarcely perceptible smile on noticing the quick change, so familiar to him, in Levin's face, which became as gloomy as it had been bright a moment before.
Esteban Arkadievich sonrió imperceptiblemente al observar el rápido –y tan conocido para él– cambio de expresión del semblante de Levin, tan triste ahora como alegre un momento antes.