The main study object of the paper is channel steel whose finite element models are founded in ANSYS the material is assumed as elastic-plastic body.

本文以槽钢为主要研究对象，假定材料为理想弹塑性体，在ANSYS中建立其有限元模型。

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Protein second structure data is chosen as main study object, and data mining and dynamic programming are applied to protein structure classification.

本文选择蛋白质二级结构数据为主要的研究对象，应用数据挖掘技术和机器学习中的动态规划理论进行蛋白质结构分类。

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Reservoir is the main study object of oil and gas exploration and production, and that the valuation of reservoir is the most important content of reservoir description.

储层是油气勘探和开发的主要研究对象，储层评价是油藏描述的核心内容。

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Now, Mars is a unique object to study I think for two main reasons - or at least I consider two main reasons.

NPR: Revisiting the Viking Missions to Mars