6 sentences

1. 我已经活得够长久了。

   wǒ yǐ​jīng huó de gòu cháng​jiǔ le.

   I have lived long enough.

   Source: OpenSubtitles

2. 两国之间建立了长久的友谊。

   liǎng guó zhī​jiān jiàn​lì le cháng​jiǔ de yǒu​yì.

   The two countries have established a long-lasting friendship.

   Source: Dong Chinese Dictionary

3. 这件往事长久地留在他的记忆里。

   zhè jiàn wǎng​shì cháng​jiǔ de liú zài tā de jì​yì lǐ.

   This past event remained in his memory for a long time.

   Source: Dong Chinese Dictionary

4. 两人靠着共同的兴趣维系着这段长久的友谊。

   liǎng rén kào zhe gòng​tóng de xìng​qù wéi​xì zhe zhè duàn cháng​jiǔ de yǒu​yì.

   The two of them maintain their long friendship through shared interests.

   Source: Dong Chinese Dictionary

5. 由于长久无人走动，林间的小行径已长满了杂草。

   yóu​yú cháng​jiǔ wú​rén zǒu​dòng, lín jiān de xiǎo xíng​jìng yǐ zhǎng​mǎn le zá​cǎo.

   Since no one had walked there for a long time, the small path in the woods was overgrown with weeds.

   Source: Dong Chinese Dictionary

6. 两人的性格实在不合，很难这样长久地将就下去。

   liǎng rén de xìng​gé shí​zài bù hé, hěn nán zhè​yàng cháng​jiǔ de jiāng​jiu xià​qù.

   Their personalities are truly incompatible, making it hard to keep settling like this for long.

   Source: Dong Chinese Dictionary