月光下，他们轻声哼唱着《月亮河》，享受着浪漫的夜晚。

Under the moonlight, they hummed ___Moon River softly, savoring the romantic evening.

他的音乐像一条宁静的月光之河，缓缓流淌在夜色中。

His music flows like a peaceful ___moon river through the night.