名词
中文翻译：次级采样单位
同义词：
['sub-sample unit', 'secondary sample unit']
例句：
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1.The research team used a secondary sampling unit to collect data from multiple sources.
研究团队使用一个次级采样单位来从多个来源收集数据。
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2. The secondary sampling unit was designed to minimize the risk of contamination during testing.
次级采样单位被设计成在测试过程中最小化污染风险。
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3.The secondary sampling unit helped us to identify patterns in the data that would have been missed otherwise.
次级采样单位帮助我们发现了数据中的模式，否则可能会错过这些模式。