phrase, idiomatic
to behave as if nothing had happened
聽了不正確的議論也不爭辯，甚至聽了反革命分子的話也不報告，泰然處之，行若無事。
听了不正确的议论也不争辩，甚至听了反革命分子的话也不报告，泰然处之，行若无事。
tīng le bù zhèng què de yì lùn yě bù zhēng biàn ， shèn zhì tīng le fǎn gé mìng fèn zǐ de huà yě bù bào gào ， tài rán chǔ zhī ， xíng ruò wú shì ． To hear incorrect views without rebutting them and even to hear counter-revolutionary remarks without reporting them, but instead to take them calmly as if nothing had happened.
Examples (Wiktionary)
Mandarin
听了不正确的议论也不争辩，甚至听了反革命分子的话也不报告，泰然处之，行若无事。
聽了不正確的議論也不爭辯，甚至聽了反革命分子的話也不報告，泰然處之，行若無事。
tīng le bù zhèng què de yì lùn yě bù zhēng biàn ， shèn zhì tīng le fǎn gé mìng fèn zǐ de huà yě bù bào gào ， tài rán chǔ zhī ， xíng ruò wú shì ．
To hear incorrect views without rebutting them and even to hear counter-revolutionary remarks without reporting them, but instead to take them calmly as if nothing had happened.