1. The crystals found in the cave were perfectly euhedral, displaying well-defined crystal faces.
这个洞穴里发现的晶体完全是有明确晶面的，展示出清晰的晶体面。

2. The euhedral nature of the mineral allowed for accurate measurements of its crystal lattice parameters.
这种矿物的明确晶面特性使得能够准确地测量其晶格参数。