与狐谋皮

Explanation: Metaphor of things harmful to seek each other's vital interests, and finally hard to achieve their goals. 　　Source: "Tai Ping Yu Lan" Volume ○ cited eight "Fu Zi" [Zhou] prefer to give the daughter of the fur, but with Fox seeking their skin; For a Shaolao treasures, and with the sheep do their shame. Words are not visible, the fox escaped the heavy fraction below the hill, sheep-phase calls into hiding in the forest, so the system for years without a fur Zhou, five years does not have a prison. " 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], 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, 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 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