degree of unsolvability

例句：

1. 1. The problem ofunsolvability is a major challengefor the development team.
   这个问题的不可解决性是开发团队面临的主要挑战。
2. 2. Thescientist found that the substance was insolublein water.
   科学家发现这种物质在水中不溶。
3. 3. The molecule's insolubility makes it difficult to purify.
   这种分子的不溶性使得其难以提纯。