根据英文词典释义,以Collins English Dictionary (柯林斯英语大词典)为例:
a Chinese green tea, the early crop of which is known as young hyson and the inferior leaves as hyson skin,from Chinese (Cantonese) hei-ch'un bright spring
Two of the five Chinese teas aboard the three ships docked in Boston Harbor in December 1773 were green teas: hyson and singlo. The better of the two was singlo. Here is the tally of chests of singlo green tea for each ship:(1773年12月停靠美国波士顿海港的三艘船上所运载的有5种中国茶,其中两种为熙春茶和松萝茶。这两种茶,松萝茶较好。每艘所载的松萝茶如下:)
The best green tea originated from the Sunglo Mountains (present day Anhui Province). This tea was called Singlo – an Anglicization of Sunglo. Due to demand, Sunglo mountain bushes were eventually propagated in lower elevation gardens. The leaves were made into tea known as Hyson. For many years, Singlo meant mountain tea and Hyson meant garden tea.