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1·Eating sea lettuce frequently is very good for one's health.

多吃海白菜对人的健康非常有益。

2·Type genus of the family ulvaceae; green seaweed having a thallus two cells thick: sea lettuce.

石莼科的模式属；绿色海藻具有两个细胞厚度的叶状体；海莴苣。