3 sentences

1. 医生必须遵守职业伦理。

   yī​shēng bì​xū zūn​shǒu zhí​yè lún​lǐ.

   Doctors must abide by professional ethics.

   Source: Dong Chinese Dictionary

2. 儒家伦理主张“亲亲”而仁民，即先爱自己的亲人。

   Rú​jiā lún​lǐ zhǔ​zhāng“ qīn​qīn” ér rén mín, jí xiān ài zì​jǐ de qīn​rén.

   Confucian ethics advocates 'affection for kin' before benevolence toward the people, meaning one should love their own family first.

   Source: Dong Chinese Dictionary

3. 这套伦理准则被古人视为不可更改的万世不磨之彝。

   zhè tào lún​lǐ zhǔn​zé bèi gǔ​rén shì​wéi bù kě gēng​gǎi de wàn​shì bù mó zhī yí.

   This set of ethical codes was regarded by the ancients as an eternal and immutable law.

   Source: Dong Chinese Dictionary