... Has Been Widely Used 得到广泛应用 Has Been Seldom Used 现已少用 Has Been Officially Used 已经正式使用 ...
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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ID 3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。
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