不过，年龄也起到一定作用。

However, aging also plays a role.

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富含钙质的干酪素对牛奶呈现白色起到一定作用。

Rich in calcium, Casein helps contribute to milk's white color.

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运气也起到一定作用：德国和北欧国家经济的复苏提振了爱沙尼亚。

Luck has played a part: Estonia has been pulled up by recovery in Germany and the Nordic countries.

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This is the kind of surveillance that's needed to really make an impact and this is why-- one of the other ways where engineering approaches are needed in order to solve medical problems like this one.

这是一种必需,起到一定作用及,影响的监测观察,并且这就是,这也是在解决类似这种医学问题时,必须采取工程方法的原因

耶鲁公开课 - 生物医学工程探索课程节选