HSK 7-9
横向
héngxiàng形
horizontal; orthogonal; perpendicular; lateral
研究同时进行了横向比较。
Yán jiū tóng shí jìn xíng le héng xiàng bǐ jiào.
The study also conducted a cross-sectional comparison.
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Appears across levels (7-9) in the HSK 3.0 word list.