Doctors Stevenson is analyzing one element—carbon-14 in ring from both living and dead trees.
史蒂文森博士正在分析一种元素——活树和死树年轮中的碳-14。
One key element is to establish a supportive working and living environment and opportunities for professional growth so that health workers are less likely to migrate.
一个关键因素是建立一个支持性的工作和生活环境，以及业务成长机会，这样，卫生人员就可以减少流动。
Strange bacteria living deep in a California lake can survive on arsenic and can even grow by incorporating the element into its DNA and cell membranes.
在加州一处湖泊深处生活的一种奇怪的细菌可以免疫砷的毒性，甚至可以将这种元素吸收进DNA和细胞膜中从而生长。
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