不管医疗科学已取得了什么样的进步，免疫系统仍是我们抵抗疾病的主要防御手段。
Despite anything the science of medicine may have achieved, the immune system is our main defence against disease.
对于伪装得很好的物种，这种危险会大大增加，它们的自然本能就是相信这种隐藏是它们主要的防御手段。
This hazard is much increased with species that are well disguised and whose natural instinct is to trust to this concealment as their principal defense.
威慑而非反导拦截仍是最佳的防御手段。
Deterrence, not antimissile interceptors, is still the best defense.
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