adj.易碎的；脆的
It reacts easily with oxygen in the air to produce crumbly red iron oxides. 它非常容易和空气中的氧气起反应
Shortbread is a short crumbly cookie. 脆饼干是一种薄的、松脆的饼干。
I'm afraid this cake has turned out very dry and crumbly. 恐怕这蛋糕已变得太干太脆了。
