level indicator

例句：

1. 1. Thelevel of the liquid is measured by alevel indicator.
   液体的水平通过一个水平指示器来测量。
2. 2. The engineer used a levelindicator to ensure that the foundation was level.
   工程师使用一个水平指示器来确保地基是水平的。
3. 3. The level indicator showed thatthe water level had risen slightly.
   水平指示器显示水位略有上升。