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Usages of yuányīn
他 不 复习 的 原因 是 太 累 了， 结果 考试 没 考好。tā bú fùxí de yuányīn shì tài lèi le, jiéguǒ kǎoshì méi kǎohǎo.
The reason he didn’t review was that he was too tired, and as a result he didn’t do well on the exam.
空气 污染 这么 严重， 一 个 原因 是 塑料 垃圾 太 多。kōngqì wūrǎn zhème yánzhòng, yì gè yuányīn shì sùliào lājī tài duō.
For air pollution to be this serious, one reason is that there is too much plastic trash.
Test yourself: What does yuányīn mean?
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