sea lettuce
sea-lettuce的词性:n.(名词)
1. Any of several green algae of the genus Ulva, having a membranous leaflike, irregularly shaped thallus sometimes used in salads. 海莴苣:一种石莼属 的绿色海藻,有膜状叶形的不规则的叶状体,经常用在沙拉中