adrenaline to noradrenaline ratio的用法和样例：
- As the heart falters, the body releases adrenaline to keep the organ pumping.
- Such talk acted like a shot of adrenaline to the stilled hearts of liberal bloggers and columnists who had feared that Obama might squander a chance to stomp on his bewildered opposition.
- The ratio of schoolboys to schoolgirls is 2 to 1.
- How much do all these figures stack up to?