N-SING
熔炉;严峻的考验;磨炼
Crucible is used to refer to a situation in which something is tested or a conflict takes place, often one which produces something new.
例句
...a system in which ideas are tested in the crucible of party contention...
各种观点得以在党派纷争的严峻考验中得到检验的体系
The regime served as a crucible for the forging of right-wing ideas and values.
该政权成为右翼思想和右翼价值观形成的熔炉。