1. The sandfrac is commonly used in hydraulic fracturing to prop open the fractures in the rock formation.
碎沙通常用于水力压裂，以撑开岩石的裂缝。

2. The sandfrac mixture consists of sand and a fluid that helps to carry the sand into the fractures.
碎沙混合物由砂和一种流体组成，可以将砂填充到裂缝中。