black gold
Longman Dictionary of Contemporary English 5++LDOCE 5++ˌblack ˈgold noun [uncountable] informal TPGoil “黑色黄金”,石油
Examples from the Corpus
black gold• And it is not gold we seek, but oil-or black gold, as some have come to call it.ˌblack ˈgold nounChineseSyllable
Corpus oil
black gold
ˌblack ˈgold
noun [uncountable] informal
oil
ˌblack ˈgold
noun [uncountable] informaloil