In French, "salade" is the word for "lettuce" except for iceburg lettuce, which is "iceburg." I suppose that it would have been "de la salade" if it was going to be translated as just "lettuce," now that I got it wrong by putting "The turtle eats lettuce." It makes more sense for the turtle to be eating lettuce, though! If you have a pet turtle, that is one of the things you feed them. But, to me, living in France and learning the language, this still says "The turtle is eating lettuce."