manganese concretion的用法和样例:
例句
- But despite millions of dollars of investment, the commercial extraction of manganese nodules never became reality.
但是尽管拥有数百万美元的投资,锰结核的商业化开采始终未能实现。 - 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.
与锰结核像高尔夫球洞一样分散在海底不同的是,这些深海矿物层则在熄灭了的海底烟囱附近小范围内存在。