3 sentences

1. 我们不应当计较个人的利害得失。

   wǒ​men bù yīng​dāng jì​jiào gè​rén de lì​hài dé​shī.

   We should not dwell on personal gains and losses.

   Source: Dong Chinese Dictionary

2. 做决定之前，我们必须仔细权衡利害。

   zuò jué​dìng zhī​qián, wǒ​men bì​xū zǐ​xì quán​héng lì​hài.

   Before making a decision, we must carefully weigh the pros and cons.

   Source: Dong Chinese Dictionary

3. 他在这桩交易中没有直接的利害关系。

   tā zài zhè zhuāng jiāo​yì zhōng méi​yǒu zhí​jiē de lì​hài guān​xi.

   He has no direct interest in this transaction.

   Source: Dong Chinese Dictionary