A person's or thing's reliance on something is the fact that they need it and often cannot live or work without it.
双语例句
例： the country's increasing reliance on foreign aid.
这个国家日益依赖外来援助。
例： The attack did signal a growing reliance upon political assassination in the province.
这次袭击表明该省对政治暗杀的日益依赖。