原委

bù míng yuán wěi wàng jiā píng lùn

不明原委，妄加评论

make presumptuous comments out of ignorance

xū gòu yuán wěi

虚构原委

make up the whole story

zhuī jiū yuán wěi

追究原委

inquire into the matter

shuō míng yuán wěi

说明原委

tell the whole story

zhǐ yǒu tā yī gè rén zhī dào shì qing de yuán wěi

只有他一个人知道事情的原委。

Only he knows all the details.

tā bǎ shì qing de yuán wěi gào sù le wǒ

他把事情的原委告诉了我。

He told me the whole story.

wèi le gōng zhèng qǐ jiàn yīng gāi ràng tā yě lái shuō shuō shì qing de yuán wěi

为了公正起见，应该让他也来说说事情的原委。

As a matter of fairness, he should be allowed to give his version of events.

táo pǎo qián tā liú xià yī zhāng biàn tiáo jiě shì yuán wěi

逃跑前，她留下一张便条解释原委。

Before she ran away, she left a note explaining her actions.