它们是莴笋。
Extraction and properties of green pigment from leaves of asparagus lettuce were reported.研究了莴笋叶绿色素的提取及其理化性质。
On the menu for special days are the few cabbages and asparagus lettuce, stored like treasure in the family's only basket.在一些特殊日子里,菜谱上才会出现少许白菜和莴笋,这也是全家菜篮子里的宝贝。