大是大非

dà shì dà fēi qián lì chǎng jiān dìng

大是大非前立场坚定

stand firm over key issues of principle

dà shì dà fēi zhī zhēng

大是大非之争

conflict of principles

fēn qīng dà shì dà fēi

分清大是大非

draw clear distinctions over key issues of principle

wǒ men bù huì zài dà shì dà fēi de tòng kǔ wèn tí shang jiū chán

我们不会在大是大非的痛苦问题上纠缠。

We won't struggle with difficult issues of right and wrong.