凝神思索 meaning in English

gaze fixedly and ponder; think hard; be deep in thought

Her face impressed the countess by its strikingly serious and concentrated expression . natasha was listening and considering
这副面孔流露着特别严肃的凝神思索的表情，使伯爵夫人觉得惊奇。
He was lying like that now on his bedstead , his huge , heavy , misshapen head leaning on his fat hand . he was thinking with his one eye wide open , gazing into the darkness
现在他就是这样躺着，用一只胖手支着他那又大又重因伤致残的头，睁着一只眼，向着黑暗处凝神思索。