ref: http://answers.unity3d.com/questions/1268607/ontriggerstay2d-do-not-called-every-fixedupdate-un.html#answer-1268627
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ref: http://answers.unity3d.com/questions/1268607/ontriggerstay2d-do-not-called-every-fixedupdate-un.html#answer-1268627
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