invaluable
/ˌɪnˈvæljəbəl/
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adj. 非常寶貴的；無價的
- Her grandfather's diaries proved invaluable when she wrote a novel about the town's past. 她寫一部關於小鎮往事的小說時，祖父的日記成了非常寶貴的資料。
其他意思
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adj. 極寶貴的, 無價的
If you describe something as invaluable, you mean that it is extremely useful.
- I was able to gain invaluable experience over that year
也出現在：
字根
val, vail 強壯；有價值
in + val + u + able不 + 價值 + — + 能……的