river可數嗎牛肉beef可數嗎

　　The river flooded the valley.

　　河水泛濫淹沒了河谷。

　　The river gurgled and burbled.

　　河水汩汩流淌。

　　Now the river bed is bone dry.

　　目前河床十分干燥。

　　Kenya's beef comes from the zebu cattle.

　　肯尼亞的牛肉是瘤牛肉。

　　They serve the most delicious roast beef.

　　他們做最美味的烤牛肉。

　　The smell of roast beef permeated the air.

　　烤牛肉的氣味彌漫在空氣中。