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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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

The price reduction effect of our oil production is spread across the entire world and is thus pretty small.

FORBES: Invest In American Manufacturing? Five Charts For Your Business Decision

Research on animals has suggested that stress can have an effect on tumour growth and the spread of cancer to other parts of the body.

BBC: Depression 'cuts cancer survival'