为了更好地开展对玉米田天敌的研究和利用工作，以及对玉米害虫的综合治理工作，进行了玉米田节肢动物的种类构成成分调查。

The composition of Arthropod species in maize fields in Daqing was investigated in order to study the natural enemy and its use work, to develop the work of integrated pest manage to the cornfield.

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能源安全的饮品，特别是能源提高成分，已由欧洲委员会调查。

The safety of energy drinks, in particular their energy-enhancing ingredients, has been investigated by a European committee.

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横截面数据：成分数据只测量一次。这展示你的变量在一个时间点的快照（如：市场调查）。

Cross-Sectional: The sample of elements is measured only once. This shows you a snapshot of variables at a point in time (e. g. , market survey).

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