HSK 7-9
并行
bìngxíng动
to proceed in parallel; side by side (of two processes, developments, thoughts etc)
新旧系统将在本月并行运行。
Xīn jiù xì tǒng jiāng zài běn yuè bìng xíng yùn xíng.
The old and new systems will run in parallel this month.
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Appears across levels (7-9) in the HSK 3.0 word list.