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Various environmental factors may play a role.

各种环境因素也可能会起作用。

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Everyone should play a part in the environmental protection.

每个人都应该在环境保护中发挥作用。

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We must be extra vigilant, The government must play its role as to make the environment safe and remove all environmental factors cancer. (OMITTED) Good sources of drinking water, he says,will stop people from going to streams and ponds, where they get infected with some of these organisms.

VOA: standard.2010.06.16

The exact cause of Type 1 diabetes is unknown, but both genetics and environmental triggers play a role.

FORBES: Magazine Article

But if only one has a condition, it is likely that environmental factors play a relatively greater influence.

BBC: NEWS | Health | Alzheimer's risk 'is 80% genetic'

In addition, they said other genetic and environmental factors play their part, shown by the fact that thin people can also carry the genetic mutations.

BBC: NEWS | Health | Faulty gene link to obesity risk