adj.易碎的；脆的
It reacts easily with oxygen in the air to produce crumbly red iron oxides. 它非常容易和空氣中的氧氣起反應
Shortbread is a short crumbly cookie. 脆餅干是一種薄的、松脆的餅干。
I'm afraid this cake has turned out very dry and crumbly. 恐怕這蛋糕已變得太干太脆了。
