Trembling. This is a refinement of equilibium. Or, you can think of it as a kind of stationary test.

"我们可以不考虑搏弈是如何达到这一点的,而考察该参与人可能的行动过程(如果对方故意的选取一个非均衡行动,则决策时应考虑这一事实)"

This is confusing. Suppose we have two players in a game. One player is playing a equilibrium strategy (under certain definition of equilibrium), and you mean the other player is implimenting a non-equilibrium strategy. This is not possible, unless you deny the assumption that the second player is not rational. A rational player will never purposely choose a non-equilibrium strategy given other player playing equilbrium strategy, since he can play equilibrium strategy and get a higher payoff.