HSK 6
成千上万
chéngqiān-shàngwàn(lit.) by the thousands and tens of thousands (idiom); (fig.) untold numbers; innumerable; countless
成千上万只鸟飞过湖面。
Chéng qiān shàng wàn zhī niǎo fēi guò hú miàn.
Tens of thousands of birds flew over the lake.
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