Usages of yuányīn
老师 在 课上 解释 了 问题 的 原因， 也 说 清楚 了 可能 的 结果。lǎoshī zài kèshàng jiěshì le wèntí de yuányīn, yě shuō qīngchu le kěnéng de jiéguǒ.
In class the teacher explained the cause of the problem and also clearly stated the possible result.
他 不 知道 这 个 问题 的 原因。tā bù zhīdào zhè gè wèntí de yuányīn.
He doesn’t know the cause of this problem.
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