UV_photocatalytic oxidation is a novel pretreatment technique for environmental water analysis, but this technique has been seldom used in domestic environmental monitoring field.
紫外光催化氧化是近年来环境水质分析中采用的一种样品预处理新技术，目前在国内环境监测领域还应用得不多。
Because the index with ID 3 has not been accessed, you can conclude that it is not used, or at least that it is seldom used.
因为索引ID3从未被访问过，所以可以推断该索引为未使用或很少使用的索引。
Fractal structure has been used for antenna design for the unique structure and performance, however it is seldom used in antenna radar cross section reduction.
分形由于其独特的结构及性能早已在天线的设计中有所应用，但较少地应用于天线雷达散射截面减缩。
At present automatic mechanical transmission (AMT) has been widely used on automobiles, but it is seldom applied to tractors.
在拖拉机上使用电控机械式自动变速器(AMT)很有必要。
Densifier has been used widely int he food industry, but it has seldom been reported in the soy sauce food.
增稠剂在食品工业中已得到广泛的应用，但在酱类食品中的应用报道较少。
Though component GIS has been widely used in many fields, its application in the area of resource and environment information system in Karst is currently seldom.
组件式GIS已应用于诸多领域，但目前在国内很少见到其在喀斯特地区资源环境中的应用。
Though component GIS has been widely used in many fields, its application in the area of resource and environment information system in Karst is currently seldom.
组件式GIS已应用于诸多领域，但目前在国内很少见到其在喀斯特地区资源环境中的应用。
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