2 sentences

1. 他总是唱高调，却从不采取任何实际行动。

   tā zǒng​shì chàng gāo​diào, què cóng bù cǎi​qǔ rèn​hé shí​jì xíng​dòng.

   He always speaks in high-sounding platitudes but never takes any practical action.

   Source: Dong Chinese Dictionary

2. 这对明星最近在社交媒体上表现得非常高调。

   zhèi duì míng​xīng zuì​jìn zài shè​jiāo méi​tǐ shàng biǎo​xiàn de fēi​cháng gāo​diào.

   This celebrity couple has been very high-profile on social media lately.

   Source: Dong Chinese Dictionary