HSK 7-9
加紧
jiājǐn动
to intensify; to speed up; to step up
工厂加紧生产防汛沙袋。
Gōng chǎng jiā jǐn shēng chǎn fáng xùn shā dài.
The factory stepped up production of flood-control sandbags.
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Appears across levels (7-9) in the HSK 3.0 word list.