5 sentences

1. 当你没有出现时，我很担心。

   dāng nǐ méi​yǒu chū​xiàn shí, wǒ hěn dān xīn.

   I was very worried when you didn’t show up.

   Source: CCMatrix

2. 所有鸟类被发现时都已死亡。

   suǒ​yǒu niǎo​lèi bèi fā​xiàn shí dōu yǐ sǐ​wáng.

   All the birds were found dead.

   Source: CCMatrix

3. 女校长出现时，学生们高声欢呼。

   nǚ xiào​zhǎng chū​xiàn shí, xué​sheng men gāo​shēng huān​hū.

   The students cheered loudly as the headmistress appeared.

   Source: AI Challenger 2017

4. 当坏消息或问题出现时，寻找改善的机会。

   dāng huài xiāo​xi huò wèn​tí chū​xiàn shí, xún​zhǎo gǎi​shàn de jī​huì.

   When bad news or problems arise, look for opportunities to improve.

   Source: CCMatrix

5. 毕竟，当现代漫画书在20世纪30年代首次出现时，他们的主要读者是儿童。

   bì​jìng, dāng xiàn​dài màn​huà​shū zài20 shì​jì30 nián​dài shǒu​cì chū​xiàn shí, tā​men de zhǔ​yào dú​zhě shì ér​tóng.

   After all, when modern comic books first emerged in the 1930s, their main readers were children.

   Source: CCMatrix