例句：
The smell of roast beef permeated the air.
烤牛肉的气味弥漫在空气中。
Japan is the biggest importer of U.S. beef.
日本是美国牛肉的.最大进口国。
Thick tuna steaks are eaten rare, like beef.
厚厚的金枪鱼片要半熟吃，就像牛肉一样。
