杯中蛇影

Explanation: With "extremely suspicious." 　　Source: Ming Cheng Dengji "Young birds learn King Lam" shadow snake cup, since the beginning suspicion; blessing in disguise, is difficult to distinguish good and bad fortune. Lucky Feng Chu, Jin-Min Wu Hong Lu Shilong boast of differentiation; V Dragon child, Sima Hui said that the odd holes Mingpang Shi Yuan. " 　　Examples: ~, "Shi said," that music wide thing, "custom links" to the main book Du things. ★ Qing Yuan Mei, "With the old books contained in the different parks Essay"