I'm doing physics, biology and chemistry.

我在学物理、生物和化学。

《牛津词典》

Students also have to learn six other subject physics, chemistry, biology, geography, politics and history.

学生还必须学习其他六门课程：物理、化学、生物、地理、政治和历史。

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This is the condition for really the lion's share of chemistry, biology, and other kinds of changes we'll be concerned with.

这是真正要在化学，生物学和我们将要关注的其他类型变化中占有最大份额的条件。

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