HSK 7-9
落差
luòchā名
drop in elevation; (fig.) gap (in wages, expectations etc); disparity
理想与现实的落差让他失望。
Lǐxiǎng yǔ xiànshí de luòchā ràng tā shīwàng.
The gap between his expectations and reality disappointed him.
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Appears across levels (7-9) in the HSK 3.0 word list.