3 sentences

1. 入伏以来，气温一直居高不下。

   rù fú yǐ​lái, qì​wēn yī​zhí jū​gāo​bù​xià.

   Since the start of the 'dog days' of summer, the temperature has remained high.

   Source: Dong Chinese Dictionary

2. 这篇文章在网络上的热度一直居高不下。

   zhè piān wén​zhāng zài Wǎng​luò shàng de rè​dù yī​zhí jū​gāo​bù​xià.

   The popularity of this article on the internet has remained high.

   Source: Dong Chinese Dictionary

3. 尽管政府采取了多项措施，当地的房价依然居高不下。

   jǐn​guǎn zhèng​fǔ cǎi​qǔ le duō xiàng cuò​shī, dāng​dì de fáng​jià yī​rán jū​gāo​bù​xià.

   Despite several government measures, local housing prices remain high.

   Source: Dong Chinese Dictionary