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.
她发现，正如她所设想的一样，有合作哺育行为的鸟类通常会有比无此行为的相近物种的其他鸟类更强的免疫反映。
She found, as she had hypothesised, that co-operatively breeding birds routinely have stronger immune responses to PHA than closely related species that do not breed co-operatively.
锌是身体的基础材料，并且在缺锌可导致发育迟缓增长，腹泻，阳痿，脱发，眼睛和皮肤损伤，无食欲，和低下的免疫力。
Zinc is a building block of the body and a deficiency in zinc can lead to stunted growth, diarrhea, impotence, hair loss, eye and skin lesions, impaired appetite, and depressed immunity.
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