In today's chemistry class, our teacher taught us how to carry out an experiment with sulphur dioxide.

今天化学课上，老师带我们做了个关于二氧化硫的实验。

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Its mission is to carry out Martin's experiment on a much grander scale, pouring iron ore into the ocean in an attempt to stimulate plankton growth and assess the wider effects on sea life.

CNN: Topical waters