孩子们通常要花一个星期的时间外宿露营。
他花了一个星期的时间到处寻找宝藏,但什么也没有找到。
He spent a week looking for the treasure everywhere, but didn't find anything.
例如,去年我的学生花了一个星期的时间观察他们自己的购买行为,并对其进行了详细分析。
For example, last year my students spent a week looking at their own purchasing and analyzed it in detail.
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