The book's aim was to make economic theory more digestible.

　　該書的目的是要讓經濟學理論更加簡單易懂。

　　Fish is inexpensive, easy to cook and very digestible.

　　魚價格便宜，容易烹調，且味美可口。

　　Bananas are easily digestible.

　　香蕉很容易消化。

　　A digestible substance used to give color to food.

　　給食品染色所用的可消化的物質。

　　A high quality, highly digestible source of protein.

　　高品質，易消化的蛋白質。