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Planetary scientists can determine a rock's age by calculating how many radioactive "parent" isotopes of a particular element have decayed into "daughter" isotopes.

行星科学家们可以通过计算一个特定元素有多少“母亲”放射性同位素衰变为“女儿”同位素来确定岩石的年龄。

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In the case of the age element, you also have a possible attribute to give the time units.

在使用age元素的情况下，还可以通过一个属性来指定时间单位。

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These include increasing working age benefits by 5.2% in April and the child element of Child Tax Credit by inflation.

BBC: Tax credit change could cost families ?4k a year - Labour

Chinese calligraphy has always been more than simply a tool for communication, incorporating as it does the element of artistry for which the practice is still valued in an age of ballpoint pens and computers.

UNESCO: Culture