It's the wistful " ah, " the rolling trill, the soothing " ess."

有着惆怅 " ah" ，颤音缓 " ess" 。

The 's' on the end is pronounced 'uz' because it followed an 'ess' sound.

末尾“s” 发音为“uz” ，因为它跟在“ess” 之后。