Solo cost is paid one time and never needs to be recalculated.
单体能力的花费只需支付一次而且永远不需再计偿。
Notice how not only did the top item get deleted, but the total was recalculated.
注意，不仅是删除了顶部的项目，而且项目总数也重新进行了计算。
Notice how not only did the top item get deleted, but the total was recalculated.
注意，不仅是删除了顶部的项目，而且项目总数也重新进行了计算。
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