以下为句子列表：
英文: A cryptographic system in which units of plain text of regular length, usually letters, are arbitrarily transposed or substituted according to a predetermined code.
中文: 密码一种密码系统，其中固定长度的明文里的单元，通常为字母，被任意倒置或按事先确定的符号系统替换
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英文: A highly sensitive chromatographic system is desirable particularly for monitoring analyte present in trace concentrations within samples.
中文: 高灵敏的层析系统是一个理想的系统，特别对监测存在于样本追踪浓度的分析物。
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英文: B Any original document(s) made by rephotographic system automated or computerized system or carbon copies shall not be acceptable unless they are clearly marked as “ORIGINAL”, and certified with signatures in handwriting by authorized officers of the iss
中文: 不接受影印、自动或电脑处理，或复印的任何正本单据，除非这些单据印有清晰的“正本”字样，并经发证单位授权的领导人手签证明。
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英文: The use of a mobile phase containing an ion pairing reagent makes it compulsory to rinse the entire chromatographic system with ultra-pure water at the end of the test and to purge the injector during this rinsing operation.
中文: 使用含离子对试剂的流动相时，检验结束后必须用超纯水淋洗整个色谱系统，并在淋洗时清洗进样器。
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