听到熟悉的旋律，他一下子想起了童年的时光。

Tīngdào shúxī de xuánlǜ, tā yíxiàzi xiǎngqǐ le tóngnián de shíguāng.

Hearing the familiar melody, he suddenly remembered his childhood days.

这首歌的旋律很简单，但特别好听。

Zhè shǒu gē de xuánlǜ hěn jiǎndān, dàn tèbié hǎotīng.

The melody of this song is very simple, but especially pleasant.

这段钢琴旋律变化丰富，却一点也不显得复杂。

Zhè duàn gāngqín xuánlǜ biànhuà fēngfù, què yìdiǎn yě bù xiǎnde fùzá.

This piano melody is rich in variation, yet it does not feel complicated at all.