2 sentences for 低低 (dī​dī)

1. 我听见卧室里有低低的锤打声。

   wǒ tīng jiàn wò​shì li yǒu dī​dī de chuí​dǎ shēng.

   I heard a low hammering sound in the bedroom.

   Source: AI Challenger 2017

2. 起飞之后，我们先在城市上空低低地飞行。

   qǐ​fēi zhī​hòu, wǒ​men xiān zài chéng​shì shàng​kōng dī​dī de fēi​xíng.

   After taking off, we first flew low over the city.

   Source: UM-Corpus: Science