So the spread of agriculture could very well have a profound effect on the composition of Earth's atmosphere.

所以农业的扩张很可能对地球大气的组成产生深远的影响。

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The overall effect, however, was the spread of confusion among the public and an increase in doubt about climate change.

尽管如此，其总体影响在民众中间传播了困惑，并增加了人们对气候变化的怀疑。

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Mass chemoprophylaxis is strongly discouraged, as it has no effect on the spread of cholera, can have adverse effects by increasing antimicrobial resistance and provides a false sense of security.

坚决不提倡大规模的预防性化疗，因为对霍乱的传播没有影响，可通过加强抗生素耐药性产生不良作用，并提供了虚假的安全感。

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How many Nutella customers would sign off on a lawsuit that seems to have the sole effect of increasing the cost of their breakfast spread and helping a few lawyers pay for their next trip to Aspen?

FORBES: Supreme Court Mulls Affirmative Action, Class Actions In Fall Docket

This year, the team looked at aspirin's effect on the spread of cancer, and found it reduced the risk of secondary spread to the lungs, liver and the brain by "about half".

BBC: Aspirin a 'no brainer' against cancer after screening

In Japan, because the rot has spread across much of the financial system and because of the debilitating effect that rot is having on consumers' confidence, and hence domestic demand.

ECONOMIST: Reality hits Japan