Functions are research objects of the calculus and limit is its research tool. The way to define the calculus concept differs distinctly from that of elementary mathematics.

微积分研究的对象是函数，研究工具是极限，微积分概念的定义方式与以往学习的初等数学概念有本质的区别。

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Chemistry, which regards the composing, the configuration, the characters and the change rule of matter as its research objects, is a natural science that bases on experiment.

化学是一门以实验为基础的自然科学。它以物质的组成、结构、性质及变化规律为研究对象。

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Literary theory should reflect on its discipline property and research objects both internally and externally in order that literary theory can be built up as an open discipline.

文学理论应该对其科学属性和研究对象等进行内在和外在的反思，从而把文学理论建构成为一门开放性的学科。

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The Institute for International Maritime Research, based in North Carolina, is looking for more objects from the colonial period.

VOA: special.2009.08.17

The objects found in Project Twenty-three could double the size of the research center's collection.

VOA: special.2010.04.07

Which is why, after a comet struck Jupiter in 1994, NASA decided to launch a research programme into Near-Earth Objects.

UNESCO: Open Access to Scientific Information

It is not impossible that one or two of these objects may, as research goes on, prove to have come from collections which were the subject of spoliation during the Nazi period.

BBC: Entertainment & Arts

Previous archaeological research has established that there was a thriving trade in metal objects throughout Europe.

FORBES: Ancient Burial Cloth Provides Clues To Bronze Age Trade