empty time slot

• 空时间槽

empty time slot的用法和样例：

例句

1. In combat, a list of Runes appears above the ATB Bar, and they can be cast at any time before a stack's turn.However, they cost resources rather than mana points.
   战斗中，符咒出现在时间槽上，在任何一个部队的行动前可施展。