这使得游戏有可能不再依赖复杂的按键组合操作。

This made possible games that did not rely on complicated combinations of buttons.

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您不能执行一个联接或合并或任何其他组合操作并映射到一个目标列表。

You cannot perform a join or a union or any other set-operation and map to a target list.

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另一种特殊情况是cumulate方法，该方法根据指定的组合操作用累积值替换每个元素。

Another special case is the cumulate method, which replaces each element with a running accumulation according to a specified combination operation.

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