lettuce      
noun [ C or U ] uk/ˈlet.ɪs/ us/ˈlet̬.ɪs/
B1 生菜;莴苣
a plant with large, green leaves, eaten uncooked in salads
 - More examples
 - She tossed the lettuce in French dressing.
 - I'd like a ham sandwich on rye, hold the lettuce.
 - Shred the lettuce and arrange it around the edge of the dish.
 - One sandwich and a lettuce leaf - I don't call that a meal!
 - Shred the heart of a lettuce and put it in a large bowl.