invaluable /ɪnˈvæljəbəl/ adjective Learner's definition of INVALUABLE
[more invaluable; most invaluable]
: extremely valuable or useful极宝贵的；极有用的 -
an invaluable experience千金难买的经历
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Their help has been invaluable to us.他们的帮助对我们极为有用。
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invaluable information/advice极宝贵的信息/建议