(比喻极难得的音信或事物) sound of footsteps in a deserted valley -- rare, welcome appearance ;

His thoughts on children's education were systematic and advanced in his time.
他的儿童教育思想是丰富的、系统的,在当时可谓空谷足音。
来源:互联网摘选His thoughts on children's education were systematic advanced in his time.
他的儿童教育思想是丰富的、系统的,在当时可谓空谷足音.
来源:互联网摘选
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