Iron-Manganese nodule的用法和樣例：
例句
- But despite millions of dollars of investment, the commercial extraction of manganese nodules never became reality.
但是盡管擁有數百萬(wàn)美元的投資，錳結核的商業(yè)化開(kāi)采始終未能實(shí)現。 - Unlike manganese nodules, which are like golf balls scattered across the sea bed, these deep-ocean deposits occur in small areas around extinct hydrothermal vents.
與錳結核像高爾夫球洞一樣分散在海底不同的是，這些深海礦物層則在熄滅了的海底煙囪附近小范圍內存在。
