通过建立能够更好地模拟体内环境的人类细胞和组织的体外模型，能防止许多这样的死亡。

Many of these deaths could be prevented through the development of in vitro models of human cells and tissues that better mimic in vivo environments.

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吸烟和肥胖是美国可以防止的死亡中的排列最前的两大原因。

Smoking and obesity are the top two causes of preventable death in the United States.

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为了避免孕产妇死亡，还必须防止意外怀孕和过早怀孕。

To avoid maternal deaths, it is also vital to prevent unwanted and too-early pregnancies.

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