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black hole

Anh-Việt Anh-Anh

lỗ đen (trong ngoại tầng không gian)
noun

plural ~ holes

[count] :an invisible area in outer space with gravity so strong that light cannot get out of it - often used figuratively

The project turned out to be a financial black hole. [=something that constantly uses up a large amount of money without producing a good result]