liquid gravity control

例句：

1. 1.The soup is made from a mixture of water and vegetables.
   这汤是用水和蔬菜混合制成的。
2. 2.The oil is used to lubricate machinery.
   这种油用来润滑机械。
3. 3.The liquid was clear and colorless.
   这种液体清澈无色。