face hardening meaning in English

表面淬火
表面硬化

Crankshaft journal face hardening machine
曲轴轴颈表面淬火机床
His face hardened at the word
他听到这话，脸沉了下来。
The lines of his face hardened , and into his eyes came a fighting light
他脸上的线条僵住了，眼里闪出拼搏的光，更加满不在乎地打量着四周的一切。
He noticed her face harden , but it was with the hardness of resolution , for still the soft color was in her cheeks and she was all glowing and melting
他注意到她的脸色僵硬了，却是下定了决心的僵硬，因为她面颊上还有温柔的红晕，仍然陶醉，仍然容光焕发。
The remorseless sea of turbulently swaying shapes , voices of vengeance , and faces hardened in the furnaces of suffering until the touch of pity could make no mark on them
激烈地震荡着的毫不内疚的人的海洋，复仇的呼号，经过苦难的熔炉锻炼得僵硬的脸，在那脸上怜悯再也留不下痕迹。