Current research comparing chemical data taken in the 1960s and 1970s with the situation today may clarify things.
目前已有研究试图把60-70年代的监测数据和现状的进行比较，以期找清原因。
In chemical data test, the guarantee of data quality has great meanings, for unusual data needs accurate diagnosis and handling.
在化工数据测试中，数据质量的保证有着很大的意义，对于异常数据需要准确诊断和处理。
Because of the commercial situation in Sweden, it was difficult to obtain pertinent chemical data on dextran, and the British, who were also manufacturing it, did not have the desired information.
由于在当时瑞典的商业形势下，很难获得相关的关于葡聚糖的化学数据，同样也制造了葡聚糖的英国人没有期望的信息。
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