HSK 7-9
平行
píngxíng形动
parallel (in a spatial or geometric sense, or figuratively); on an equal footing; on the same level; simultaneous; concurrent
这两条轨道始终保持平行。
Zhè liǎngtiáo guǐdào shǐzhōngbǎochí píngxíng.
These two tracks remain parallel throughout.
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Appears across levels (7-9) in the HSK 3.0 word list.