So, this really just means for frequency, it's a frequency label.
你要说米每秒,所以它仅仅是,用来表示频率的,是个频率的标志。
They use food frequency questionnaires, which I mentioned before, surveys, and then biological markers like blood tests of certain things to see how diet is related to health.
研究员还运用食物频率调查表,我之前曾提到过,各类调查以及生物标志物,像是血液检测等手段,来研究饮食与健康之间的关系
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