护士检查了病人的呼吸和脉搏速率。

The nurse checked the patient's ___rate of breathing and pulse.

科学家们对极地冰层融化的速度感到担忧。

Scientists are concerned about the ___rate at which polar ice is melting.

要保持竞争力，我们必须提高创新速度。

To remain competitive, we must improve our ___rate of innovation.