mercury differential thermometer

例句：

1. 1.Mercury is a toxic element that can cause serious health problems.
   水银是一种有毒元素，可能导致严重的健康问题。
2. 2. The mercury levels in the water have been rising due to pollution.
   由于污染，水中的汞含量正在上升。
3. 3. Mercury vapor is a dangerous substance that can cause lung damage.
   汞蒸气是一种危险的物质，可能导致肺部损伤。