第二种，用复合的方法，用划分等级，标签等等用来寻找类似item。
In the second, the collaborative approach, actions such as ratings, bookmarking, and so forth are used to find similar items.
方法采用DD探测29例患者牙洁治前后颊、舌面的荧光值，分析不同的色斑计分等级对DD探测龋齿时的影响程度。
Methods We collected 29 patients who wanted to do scaling, and examined the buccal or lingual surface of their posterior teeth with DD before and after scaling.
本研究通过划分等级及对比研究的方法，探讨了乒超联赛中各俱乐部主场优势效应的存在规律。
By dividing different levels and using a comparative way, the study explored the law of home advantage in China table tennis super league (CTTSL).
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