invaluable
[形容词]
holding such great value or importance that it cannot be measured or replaced

无价的, 不可估量的
productive
[形容词]
producing desired results through effective and efficient use of time, resources, and effort

富有成效的, 有效的

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holding such great value or importance that it cannot be measured or replaced
无价的, 不可估量的
producing desired results through effective and efficient use of time, resources, and effort
富有成效的, 有效的