A pulldown RESISTOR to the negative rail will allow the OUTPUT to approach that rail (provided the load impedance is high enough, or is also grounded to that rail), but ONLY slowly.

• 一个下拉电阻器将允许输出迫近迫近该电源轨(所提供的负载阻抗足够高,或负载也是接地的)，但这样速度较慢。