Does your watch tell you what year it is?
你的手表告诉你现在是哪一年了吗?
By looking up the elements in the rings for a given year, scientists can tell what elements were in the air that year.
通过查找某一年年轮中的元素,科学家可以知道那一年空气中的元素是什么。
"It took a seven-year-old to tell us what was," he explained.
他解释说:“一位七岁的小家伙告诉了我们是什么意思。”
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