exchangeable：adj.可交换的;可交易的;可兑换的;可更换的；
例：
Exchangeable K of all treatments increases in the different degree.
所有处理的交换性钾均不同程度的提高。
Exchangeable calcium contents in 72.8% production units were middle or low.
交换性钙含量处于中下水平的生产单位占72.8%。
Then substitute and standardize gradually to make the system be exchangeable flexible system.
然后再逐渐替换、逐渐的标准化，使系统变成可插拔可替换、富有弹性的体系。
Effects of Percentage of Exchangeable Sodium in Soil on Mycorrhizal Development of.
土壤碱化度对高羊茅和芨芨草菌根发育的影响。
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