你需要确定蜘蛛的数量。
选择值时，您需要确定队列上的平均消息大小以及队列上的平均消息数量。
When choosing values, you need to determine the average size and average number of messages that will be on the queue.
十分有趣的是，复审还被委托确定需要机器人的适当数量，从而使人类航空事业在长期内更加多产值和低成本。
It is interesting, then, that the review is also instructed to determine the appropriate amount of robotic activities needed to make human spaceflight productive and affordable over the long term.
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