例如数学中的原子，质数。

Take the atoms of mathematics, the primes.

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某些学科，例如数学和物理，是很难学的。

Some, subjects, such as maths and physics, are very difficult to learn.

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某些学科，例如数学和物理，是很难学的。

Some subjects, such as maths and physics, are very difficult to learn.

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You know, if you are looking to go into business, learn math really well, learn economics really well.

例如，如果你将来想从商，你现在就要学好数学和经济学。

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