Hare's hydrometer

例句：

1. 1. The hare's hydrometer is a tool used to measure the density of water.
   海狸秤是一种用来测量水密度的工具。
2. 2. The hare's hydrometer was invented by a scientist who wanted to improve fishing techniques.
   海狸秤是由一位科学家发明的，他想要改进钓鱼技术。
3. 3. The hare's hydrometer is commonly used in scientific research and testing.
   海狸秤在科学研究和测试中被广泛使用。