如果无法达成协议，我们只能打官司。

Rúguǒ wúfǎ dáchéng xiéyì, wǒmen zhǐ néng dǎ guānsī.

If we can't reach an agreement, we can only file a lawsuit.

在法庭上打官司需要雇佣律师。

Zài fǎtíng shàng dǎ guānsī xūyào gùyōng lǜshī.

Hiring a lawyer is necessary when suing in court.

打官司需要充分准备和收集证据。

Dǎ guānsī xūyào chōngfèn zhǔnbèi hé shōují zhèngjù.

Filing a lawsuit requires thorough preparation and collecting evidence.