gone through fire and water
...ad/at the critical time 千锤百炼A good nail does not fear the hammer.(steeled and tempered；gone through fire and water) 千载难逢It only happens once in ablue moon.(It chances in an hour that happens not in seven years.
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gone through fire and water
经历了水火
以上为机器翻译结果，长、整句建议使用 人工翻译 。