The team identified 39 of these traditions that are practiced by some communities but not others. This is a pattern that, at the time, hadn't been seen in any animal except humans.

该研究小组找出了39个传统行为，一些群体有这些行为，但另一个群体却没有。当时，这种模式只存在于人类之中。

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Weed survey was conducted by sampling methods of inverted W-pattern to determine the species composition and structure of weed communities in maize fields in Hebei Province.

采用倒置“W”取样法对河北省玉米田杂草进行了调查，以明确田间杂草的种类组成及群落结构。

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