HSK 7-9
可想而知
kěxiǎng’érzhī(idiom) (it) goes without saying; can well be imagined
道路全被淹没危险可想而知。
Dào lù quán bèi yān mò wēi xiǎn kě xiǎng ér zhī.
The danger is easy to imagine when the roads are entirely flooded.
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Appears across levels (7-9) in the HSK 3.0 word list.