名词
中文翻译：直接染色
同义词：
['direct coloring', 'direct marking']
例句：
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1.The scientist used a special stain to identify the bacteria in the sample.
科学家使用一种特殊的染色剂来识别样本中的细菌。
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2. During the experiment, the samples were stained with different colors to observe their differences.
在实验中，样品被染上了不同的颜色以观察它们的差异。
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3. The stain on the fabric was so strong that it could not be removed by washing alone.
布料上的染料太浓了，无法仅通过洗涤去除。