top spin ball的用法和样例：
例句
- A tennis ball spins more on clay courts than on grass courts.
网球在土场上比在草场上旋转更明显。 - By following the eye movements of volunteers as they spin in his whirling chair, Paige has found that this vestibulo-ocular reflex is slower in older subjects.
佩奇通过注视自愿受试者坐在转椅上旋转时的眼睛运动，发现这前庭视觉反应在老年受试者要比较慢些。
