To express one's thoughts or feelings in mere words or theories, often implying a lack of concrete action or practical application; to pay lip service.
他的计划听起来很宏伟，但如果只是托之空言，没有任何实际行动，那也只是梦想罢了
His plan sounded grand, but if he merely expresses it in words without any concrete action, it will remain nothing but a dream.
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