tetrahydrate

例句：

1. 1. This compound is a tetrahydrate of the sulfur dioxide.
   这种化合物是二氧化硫的四水合物。
2. 2. The tetrahydrate can be used as a dehydrating agent in the pharmaceutical industry.
   四水合物可以作为制药工业中的脱水剂使用。
3. 3. The tetrahydrate was found to have a high boiling point and low melting point.
   四水合物被发现具有高沸点和低熔点。