难溶是指在室温20℃时某种物质溶解度在0.01克以下的物质。通常把溶解度小于0.01g/100H2O的电解质，称为难溶电解质。
adj. indissolvable
只有将这些难溶物质考虑进去，化学图才能和浮游图相匹配。
Only when this refractory material is taken into account does the chemical map match the planktonic one.
溶磷微生物是一类参与土壤磷循环的重要微生物类群，它们能够将土壤中的难溶无机磷转化为有效态磷。
Phosphate-dissolving microorganisms in soils play an important role in phosphorous cycling, converting insoluble phosphate into soluble forms.
金属离子和无机酸的阴离子生成一种难溶的盐。
The metal ion and the anion of the mineral acid form an insoluble salt.
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