extension upward of the toes when the sole of the foot is stroked firmly on the outer side from the heel to the front; normal in infants under the age of 2 years but a sign of brain or spinal cord injury in older persons是什么意思_extension upward of the toes when the sole of the foot is stroked firmly on the outer side from the heel to the front; normal in infants under the age of 2 years but a sign of brain or spinal cord injury in older persons在线翻译_英语_读音_用法_例句