Examples
kē xué jiā科学家yán jiū研究le了shù mù树木nián lún年轮de的shù jù数据。
科学家研究了树木年轮的数据。
The scientists looked at tree-ring data.
我数了一下，这样一棵松树有三百多圈年轮。而砍倒它只需要15分钟。
I counted. A pine tree like this has over three hundred annual rings, yet it took only 15 minutes to cut it down.