由于人无天然的免疫力，一种新的流感病毒可引起广泛的死亡、疾病、社会和经济破坏。
As people would have no natural immunity, a new influenza virus could cause widespread death, illness, social and economic disruption.
在农场和花圃中通常使用的化学物质会破坏昆虫的中枢神经系统，使蜜蜂群对疾病和害虫的免疫力下降。
The chemicals, which are routinely used on farms and garden centres, attack the central systems of insects and make bee colonies more vulnerable to disease and pests.
皮质水平可影响睡眠、体重的增长，修复被破坏或弱化了的免疫力。
Cortisol levels can affect sleep, weight gain, burnout and weakened immune resistance.
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