bread 为什么不可数? cake为什么有时候也不可数?答:- Liquids: water, oil, tea, coffee, wine, beer, milk, coke, gasoline, etc.- Powdery or fine granular substances: flour, salt, sugar, rice, sand, etc.- Solid objects: common solid objects can be further distinguished as follows:- Food: bread, butter, chocolate, meat (beef,...