实现服务时，必须使其能够承受服务的抵赖攻击，从而保持高度可用。
The service must be implemented such that it can withstand denial of service attacks and hence remain highly available.
由于他们有可能以后还会保持这种关系，所以可能无法承受相互攻击的后果。
Since they may have to do so again they could not afford to savage each other.
研究者称，这是因为男人因承受风险而进化，比如攻击配偶竞争者——以增加延续火种的可能性。
The researchers say this is because men evolved to take risks like attacking rivals for mates — this increased the likelihood of their genetic material being passed on.
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