black gold
black gold — noun
1. a name used informally for crude oil, meaning the thick, dark liquid that is tak
a name used informally for crude oil, meaning the thick, dark liquid that is taken from under the ground or the sea bed and is the source of fuels such as petrol and plastics — the nickname 'black gold' reflects how valuable oil is to the global economy.
The small desert nation grew rich when it discovered black gold beneath its sands in the 1960s.
uncountable, metaphorical: black gold beneath [place]
Pipelines carry black gold from the oil fields hundreds of kilometres to ports on the coast.
Rafael explained to his classmates that black gold is not a type of metal but crude oil used for energy.
When the price of black gold rises sharply, the cost of petrol and heating fuel usually goes up as well.
Environmental groups argue that the world will one day need to stop depending on black gold.
文法句型
uncountable noun, no article when used as a mass noun
用法筆記
Uncountable noun — you never say 'a black gold' or 'two black golds.' Frequently used in journalism and policy discussions about energy, trade, and geopolitics.