So this is one more example of stressing why I only want to come access to the instances through defined methods.

其他相关的值也会变化,我想要这些值会一起变化,这就是另外一个强调为什么。

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Now the intervention studies are stronger methods than the epidemiology studies but they're also more difficult studies to do.

相比传染病学研究,干预性研究更有效,但也更难执行

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