Instead the abstract idea behind the actor may be brought forward.
相反，参与者背后的抽象概念可能将被提出来。
This is a big step forward in reducing verbosity but is still not any more abstract - it still forces the user to calculate the comparison function imperatively.
这在减少冗余性的路上已经跨进了一大步，但仍然不是很抽象，因为它还是会要求用户以命令方式来计算比较函数。
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