4 sentences

1. 我们已带着两名人质升空。

   wǒ​men yǐ dài zhe liǎng míng rén​zhì shēng​kōng.

   We are now in the air with two hostages.

   Source: OpenSubtitles

2. 火箭发射升空了。

   huǒ​jiàn fā​shè shēng​kōng le.

   The rocket was launched into the sky.

   Source: Dong Chinese Dictionary

3. 载人航天火箭在众人的欢呼声中成功升空。

   zài​rén​háng​tiān huǒ​jiàn zài zhòng​rén de huān​hū​shēng zhōng chéng​gōng shēng​kōng.

   The manned space rocket successfully blasted off amidst the cheers of the crowd.

   Source: Dong Chinese Dictionary

4. 巨大的热气球在众人的欢呼声中缓缓升空。

   jù​dà de rè​qì​qiú zài zhòng​rén de huān​hū​shēng zhōng huǎn​huǎn shēng​kōng.

   The massive hot air balloon slowly ascended amidst the cheers of the crowd.

   Source: Dong Chinese Dictionary