果然不出所料，胸腺嘧啶的变异同样和吸烟者发生肺癌的机会呈正相关。
Not surprisingly, having the t variant also correlates with the chance of a smoker getting lung cancer.
第二个风险，或人们更忧虑的是，病毒如果有足够的机会，可能将变异为对人类更具传染性的类型，在人与人之间迅速传播。
A second risk, of even greater concern, is that the virus - if given enough opportunities - will change into a form that is highly infectious for humans and spreads easily from person to person.
这种交互作用可以出现在发育的不同时期，进一步增加变异的机会。
Thisinteraction can occur at varying points during development, further increasing the opportunities for variation.
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