fluid beef extract

例句：

1. 1.The water in the bottle is fluid.
   瓶子里的水是流动的。
2. 2. Theriver flows through thevalley.
   这条河流经山谷。
3. 3. The oil is a fluid that canbe poured easily.
   这种油是一种可以轻易倾倒的流体。