清代乾隆皇帝把茶叶称为“润莲心”。甘露润莲心，即向杯中注入少量热水，起到润茶的作用。

Emperer Qianlong in the Qing Dynasty referred to the tealeaves as the heart of lotus;"Sweet dew quenches the heart of lotus",means pouring a little amount of water on the tea leaf to moisten the tea.