圖像來源，BBC CHINESE/ TING CHIANG
Clean living conditions that lessen exposure to microorganisms are linked to an increase in allergies. Mouse data reveal how the environment affects allergic immune responses.
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But the majority of the economic literature points to these drawbacks being eventually mitigated by the economic upsides to immigration. Higher housing prices are usually offset by increased supply owing to many immigrants joining the construction industry. And the greater GDP growth that usually accompanies immigration can actually raise native-born wages, the Deloitte researchers noted, by boosting overall productivity.
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