英語牛肉可數還是不可數名詞

例句：

The smell of roast beef permeated the air.

烤牛肉的氣味瀰漫在空氣中。

Japan is the biggest importer of U.S. beef.

日本是美國牛肉的.最大進口國。

Thick tuna steaks are eaten rare, like beef.

厚厚的金槍魚片要半熟吃，就像牛肉一樣。