HSK 7-9
低下
dīxià形
low status; lowly; to lower (one's head)
老厂生产效率一直很低下。
Lǎo chǎng shēng chǎn xiào lǜ yì zhí hěn dī xià.
The old factory has long had low production efficiency.
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Appears across levels (7-9) in the HSK 3.0 word list.