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If you describe something as invaluable, you mean that it is extremely useful.
I was able to gain invaluable experience over that year.
在那一年里我获得了十分宝贵的经验。
雅思英语词汇收录8785个雅思英语词条，基本涵盖了全部常用雅思英语词汇的翻译及释义，是英语学习的有利工具。