在小样本研究中，尽管采用了随机法，但两组间偏倚还是很容易发生的。
In studies with small sample sizes, imbalances between the two groups can easily occur despite randomisation .
利用最大树法来实现对小样本案例的聚类与提取，避免了制定推理规则的复杂性。
Using maximal tree method to cluster and extract the small cases, it avoids the complexity of establishing reasoning rules.
射线荧光光谱法是一种用于固体和液体具有最小样品处理的元素分析的仪器分析技术。
X-ray Fluorescence (XRF) Spectrometry is an instrumental analytical technique for the elemental analysis of solids and liquids with minimal treatment.
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