Powdered coal was reacted with deionized water and carbon dioxide at temperatures of 25, in seven custom-built batch reactors – conditions similar to the in situ formation conditions.
这个句子中用了两个横杠,第一个横杠是用于连接不可分割的两个词,第二个是啥意思呢,相当于whose吗?而且condition和similar之间感觉缺少系动词,谢谢老师耐心解答