HSK 7-9
举足轻重
jǔzú-qīngzhòngto play a critical role (idiom); influential
港口在当地经济中举足轻重。
Gǎng kǒu zài dāng dì jīng jì zhōng jǔ zú qīng zhòng.
The port plays a crucial role in the local economy.
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Appears across levels (7-9) in the HSK 3.0 word list.