5 sentences

1. 知己知彼，百战不殆。

   zhī​jǐ zhī bǐ, bǎi​zhàn​bù​dài.

   Know yourself and know your enemy, and you will never be defeated in a hundred battles.

   Source: Dong Chinese Dictionary

2. 我们不能厚此薄彼。

   wǒ​men bù néng hòu​cǐ bó bǐ.

   We should not favor one over the other.

   Source: Dong Chinese Dictionary

3. 知彼知己，方能百战不殆。

   zhī bǐ zhī​jǐ, fāng néng bǎi​zhàn​bù​dài.

   Know yourself and know your enemy, and you will never be defeated.

   Source: Dong Chinese Dictionary

4. 彼采萧兮，一日不见，如三秋兮。

   bǐ cǎi xiāo xī, yī rì bù jiàn, rú sān​qiū xī.

   He is gathering mugwort; a day without seeing him feels like three years.

   Source: Dong Chinese Dictionary

5. 彼时彼刻，他们正处于困境之中。

   bǐ​shí bǐ kè, tā​men zhèng chǔ​yú kùn​jìng zhī​zhōng.

   At that very moment, they were in the middle of a predicament.

   Source: Dong Chinese Dictionary