HSK 7-9
堵塞
dǔsè动
to clog up; blockage
落叶堵塞了路边排水口。
Luò yè dǔ sè le lù biān pái shuǐ kǒu.
Fallen leaves blocked the roadside drain.
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Appears across levels (7-9) in the HSK 3.0 word list.