这种竞争驱使原始人变成更好的媒母机器并花费(可能非常巨大甚至是危险)更多的脑容量负载和能量，最终变成一种互惠共生关系。
This drove these hominids to become better meme machines and to carry the (potentially huge and even dangerous) burden of larger brain size and energy use, eventually becoming symbiotic.
如果负载超过了系统的容量，则不管最大消息的值是多少，消息都将排队等候。
Should load exceed the capacity of the system, messages will queue up irrespective of the maximum messages value.
扩展：与适应周期性负载相比，升级容量是更常见的扩展情况。
Scaling: Upgrading capacity is a more common case of scaling than is accommodation of cyclical loads.
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