серьёзное испытание(The money problem was an acid test in their relationships – Проблема с деньгами стала серьёзным испытанием для их отношенийTaras)
коэффициент быстрой ликвидности(Is another term to describe the Quick Asset Ratio. It measures an organization's liquidity by adjusting current assets by subtracting inventories and then dividing by the current liabilities. Found on oasismanagement.comAlexander Demidov)