HSK 7-9
何况
hékuàng连
let alone; to say nothing of; besides; what's more
这路白天都难走何况夜里。
Zhè lù bái tiān dōu nán zǒu hé kuàng yè lǐ.
This road is difficult even by day, let alone at night.
Say it
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Appears across levels (7-9) in the HSK 3.0 word list.