You can help your child track his or her distances in a simple notebook or on the computer. Just write down the date and the estimate of the distance.
你可以帮助你的孩子在一个简单的本子或者电脑上记录每次跑步的距离，仅仅日期和每次的估计里程就足够。
Making this estimate is a relatively simple task, not so simple is estimating how many of these worlds might play host to life.
估算有多少外行星是简单的工作，但是要估算这些外行星上中有多少可能有生命的存在就没有那么简单了。
Sume and were given a simple maze to solve. To measure self-confidence, job applicants were asked to estimate how many mazes they could solve in fifteen minutes.
并被要求解一个简单的迷宫。为了评测求职者的自信心，他们被要求估量自己在十五分钟内能解多少个迷宫。
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