黄雀在后

Explanation: Analogy opportunistic attacks from behind, but also have to worry about metaphor 　　Usage: The main predicate; for clauses, attributive; containing derogatory 　　Source: Han Liu Xiang, "said park being admonished": "Park in the tree on which there is the cicada, lament highest dew drink, I do not know mantis afterwards! Mantis committed tarsal Give cicada song, but I do not know oriole, in its Pong also. " 　　Results: Mantis stalks the cicada 　　Postscript: Mantis stalks the cicada Thesaurus:  Yellowbird Server cicada, fear of disturbance in the rear