“rare metal”的概念、定义、翻译、参考文献-科学参考

单词	rare metal
释义	rare metal [`rer `med·ǝl] ^METALLURGY Any metal that is difficult to extract from ore and is rare and expensive commercially; includes masurium, alabamine, and virginium.
随便看	gravity anomaly gravity bar gravity bed gravity cell gravity chute gravity classification gravity-collapse structure gravity concentration gravity conveyor gravity corer gravity dam gravity drainage gravity drainage reservoir gravity erosion gravity fault gravity feed gravity flow gravity-flow gathering system gravity-gradient attitude control gravity gradiometry gravity haulage gravity incline gravity map gravity meter gravity pendulum

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