According to the nutrition and health expert Sarah Hampl, M. D., you can actually use your hand to estimate the portion size.
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这篇日志向读者介绍了美国疾控中心长期提倡的应急常识，比如家中准备一个应急包，里面装上水、食物等。
The blog points readers to emergency preparedness tips that the CDC has long advocated, such as having an emergency kit at one's home containing water, food.
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