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不溶的, 难溶的
unable to be dissolved, especially in a liquid
- The sugar remained insoluble in the cold water.
糖在冷水中仍然不溶。
- Despite stirring, the powder remained insoluble.
尽管搅拌，粉末仍然不溶。
- The insoluble residue settled at the bottom of the container.
不溶残渣沉淀在容器底部。
- Over time, the mineral became more insoluble in water.
随着时间的推移，矿物在水中变得更难溶。
- Insoluble particles floated in the undissolved solution.
不溶性颗粒漂浮在未溶解的溶液中。
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无法解决的, 没有解决希望的
without hope of solution