空谷足音

Explanation: In the silence of the valley I heard footsteps. Analogy is extremely difficult to get news, views, or visit. 　　Usage: Partial official; as object; describe such things 　　Source: He replies, "Zhuang Zi Xu no ghosts": "celebrity footsteps trampling but hi carry on." 　　Examples: Fortunately, ~, to see such a gentleman, opportunity can no longer, Qianzaiyishi, so congenial to endure shame. (Qing Ji Yun "Yue Wei Cao Tang notes," Volume 17) Thesaurus:  not likely to happen in a century, once in a blue moon, walk with difficulty, fish for a needle in the ocean; look for a needle in a haystack, Impossible and, Sea Fishing, Makes all things easy, bark [bay] at the moon [bay the moon], Rarities, once in thousand years, sth.seldom seen or hardly possible as the iron tree blooms, Hard-won, defy Beyond the bounds of, strength of nine bulls and two tigers,mighty force, doomed petition like asking a tiger for its hide, Leather and Fox plan Antonym Group:  Have no choice but Shengji, Just to stoop and gather Are all, as thick as June blackerries, ubiquitous, overrun, cataclysm crosscurrent, Attracting attention Are all, common and numerous, Even flat-bed truck