Chemistry is a subject based on experiments.

化学是一门以实验为基础的学科。

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Biology is a science which is based on experiments, and the experiment is an important part in biology teaching.

生物科学是一门以实验为基础的自然科学，实验是生物教学的一个重要组成部分。

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Biology is a natural science based on experiments, the teaching of which plays an essential role in biology classes.

生物学是一门建立在实验基础上的自然学科，实验教学在整个生物教学中占有重要地位。

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But it is a scientific theory based on repeated observations, experiments,measurements and discoveries.

VOA: special.2009.12.01

Based on experiments such as these, de Waal came to believe that the sense of fairness observed in monkeys is egocentric.

CNN: Morality: It's not just for humans

Many such explanations arise from the idea that males have more to gain than females do by seeking a large number of mates a notion that is ultimately based on experiments with fruit flies in 1948.

NEWYORKER: It Ain��t Necessarily So

Based on two experiments, the Fermilab team found that there is only a one-in-550 chance that the signal was a statistical fluke.

WSJ: Physicists Find Signs of Higgs Boson, or 'God Particle'