He grew a different crop on the same field five years in a row, what researchers call crop rotation.
他连续5年在同一块地上轮流种植不同作物,研究人员称之为轮作。
The longest track and field event at the Summer Olympics is the 50-kilometer race walk, which is about five miles longer than the marathon.
夏季奥运会最长的田径项目是50公里竞走,比马拉松距离还长大约5英里。
The field of inquiry has narrowed down to five persons.
调查的范围已经缩小到只剩5个人了。
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