jaw setting meaning in Chinese

颚板间距

Outside, natalie pulls the handkerchief off an almost unchanged face; sharper, paler still beautiful, the mouth thinner, the jaw set harder .
一到外面，娜塔丽就拉下手帕，露出了一张几乎没变样的脸；更瘦削、更苍白，仍然很美，嘴唇显得更薄，下巴显得更坚定。
I ll get a divorce . and she saw his jaw set . inwardly she exulted
她看见他把牙关啼紧了，她心里暗地里在狂喜着。
His face flushed , his jaw set , and unconsciously his hand clenched , unclenched , and clenched again as if he were taking fresh grips upon some hateful thing out of which he was squeezing the life
他的脸红了，牙关咬紧了，拳头不知不觉攥了起来，放开，又攥了起来，仿佛在攥着什么可恶的东西，想把它捏死。