polymetallic nodules的用法和樣例：
例句
- This paper is of important literature value and practical importance to the ocean polymetallic nodule mining in China's mine area.
文章對中國大洋多金屬結核礦產資源的開發，有著重要的文獻價值和實用意義。 - This paper focuses on experimental investigation on theresidue of ocean polymetallic nodules and cobalt-rich crusts used as cementreplacement and cement admixture.
重點開展了大洋多金屬結核氨浸渣和富鈷結殼酸浸渣作為混凝土摻合料及水泥混合材的實驗研究。
