HSK 7-9
别说
biéshuō连
to say nothing of; not to mention; let alone
别说跑步了他走路都累。
Bié shuō pǎo bù le tā zǒu lù dōu lèi.
He gets tired even walking, let alone running.
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Appears across levels (7-9) in the HSK 3.0 word list.