3 sentences

1. 那声音清脆悦耳，听起来仿佛是小鸟在歌唱。

   nà shēng​yīn qīng​cuì yuè'ěr, tīng qi​lai fǎng​fú shì xiǎo​niǎo zài gē​chàng.

   The sound was crisp and melodious, sounding just like a bird singing.

   Source: Dong Chinese Dictionary

2. 清澈的溪流流过浅濑，撞击岩石发出悦耳的响声。

   qīng​chè de xī​liú liú​guò qiǎn lài, zhuàng​jī yán​shí fā​chū yuè'ěr de xiǎng​shēng.

   The clear stream flows over the shallow rapids, making a pleasant sound as it hits the rocks.

   Source: Dong Chinese Dictionary

3. 夏天的树林里到处都是飞舞的昆虫和悦耳的蝉鸣。

   xià​tiān de shù​lín lǐ dào​chù dōu shì fēi​wǔ de kūn​chóng hé yuè'ěr de chán​míng.

   The summer woods are filled with flying insects and the pleasant sound of chirping cicadas.

   Source: Dong Chinese Dictionary