HSK 7-9
不言而喻
bùyán’éryù(idiom) it goes without saying; it is self-evident
按时检查的重要性不言而喻。
Àn shí jiǎn chá de zhòng yào xìng bù yán ér yù.
The importance of timely inspections goes without saying.
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Appears across levels (7-9) in the HSK 3.0 word list.