a rollover jackpot的用法和样例：
- You can alsomark each button with a rollover title.
- In order to further boost protection in the event of a rollover scenario, the curtain deflates slowly.
- A position changes its average price with the selected number during a rollover.
- This action occurs before any mouse buttons are clicked and is triggered by cursor fly-over only, and is commonly referred to as a “rollover.
这一动作出现于鼠标按键被单 击 之前，并且仅仅在光标掠过时激活的行为。