HSK 7-9
间隙
jiànxì名
interval; gap; clearance
列车运行间隙安排轨道检修。
Liè chē yùn xíng jiàn xì ān pái guǐ dào jiǎn xiū.
Track maintenance is scheduled between train services.
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Appears across levels (7-9) in the HSK 3.0 word list.