Iron deficiency leaves you exhausted and can reduce immunity, but your hands hold a clue.
缺铁会使你感到疲倦，有可能降低免疫力，而你的手里就掌握着线索。
Immunity is developed over years of exposure, and while it never gives complete protection, it does reduce the risk that malaria infection will cause severe disease.
多年接触会形成一定程度的免疫力，虽然这并不能完全防护，但确实会降低感染疟疾后出现重症的风险。
Bacteria become active as a result of anything that can reduce the person's immunity, such as HIV, advancing age, or some medical conditions.
由于可降低人的免疫力的任何东西，例如艾滋病毒、年龄增长或某些医学病症，细菌变为活动性。
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