以下为句子列表：
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: A team led by Stanford University scientists reconstructed dietary sources of recent and ancient condors by measuring carbon and nitrogen isotope concentrations in feather and bone remains.
中文: 由史丹佛大学科学家所率领的小组，测量了秃鹰遗骸的羽毛及骨骼中，碳及氮同位素的浓度，而重建了古今秃鹰的食物来源。
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英文: Acid soils often contain substantial concentrations of iron and aluminum hydroxides.
中文: 酸性土壤富含铁和铝的氢氧化物。
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英文: Although acid is often thought to be the stomach's main line of defense against invading bugs, the researchers found that E. coli, Salmonella and other bacteria could survive for hours in it, whereas high normal concentrations of nitrite plus acid killed
中文: 虽然我们常视胃酸为胃部抵御入侵病菌的主要防线，然而研究者却发现大肠杆菌、沙门氏菌以及其他细菌可以在胃中存活数小时。
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英文: An experiment was conducted to measure and analyze five important parameters of indoor air quality (LAQ) in public such as the surroundings of food and drink in hotels, including indoor temperature, indoor relative humidity, indoor concentrations of CO2,
中文: 摘要主要针对公共场所（酒店餐饮空间）的室内温度、相对湿度、CO2体积分数、甲醛(HCHO)和总挥发性有机物(TVOC)质量浓度等5个室内空气质量的重要参数进行了检测和分析。
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