topping-up pump

例句：

1. 1. The topping-up pump is used to refill the patient's fluids.
   充值泵用于给病人补充液体。
2. 2. The doctor needs to top up the patient's oxygen supply with a new bottle of gas.
   医生需要用新的气体瓶给病人补充氧气供应。
3. 3.The top-up pump was designed to prevent leaks in the medical equipment.
   充值泵被设计用来防止医疗设备的泄漏。