HSK 7-9
堆积
duījī动
to pile up; to heap; accumulation
大量货物堆积在港口仓库。
Dà liàng huò wù duī jī zài gǎng kǒu cāng kù.
Large quantities of goods have accumulated in the port warehouse.
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Appears across levels (7-9) in the HSK 3.0 word list.