◎空谷足音kōnggǔ-zúyīn
[the sound of footsteps in a deserted valley-a news or a statement which one does not hear often，or a thing that was seldom to found] 空曠的山谷里聽到的人的腳步聲。比喻十分難得，極為可貴的
這就是十一位舉人中的空谷足音?！?span id="c2okegi2m" class="bold">《醒世姻緣》
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