HSK 7-9
棱角
léngjiǎo名
edge and corner; protrusion; sharpness (of a protrusion); craggy
木桌棱角已经被磨圆了。
Mùzhuō léngjiǎo yǐjīng bèi móyuán le.
The corners of the wooden table have been worn smooth.
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Appears across levels (7-9) in the HSK 3.0 word list.