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insoluble adjective PROBLEM

US also insolvable (of a problem) so difficult that it is impossible to solve(问题)无法解决的

Traffic congestion in large cities seems to be an insoluble problem.大城市的交通堵塞问题似乎无法解决。

insoluble adjective SUBSTANCE

(of a substance) impossible to dissolve(物质)不能溶解的

These minerals are all insoluble in water.这些矿物质都不溶于水。

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