Using the auxiliary function, studies the boundedness of solutions of a kind of 2-order nonlinear differential equations with delay, then gives sufficient conditions of them.
利用辅助函数对一类二阶非线性微分方程进行研究，给出了其解有界的充分条件。
According to different features of conclusion about middle value questions in differential calculus, four kinds of methods about the auxiliary function structures will be concluded.
针对微分中值问题的结论的不同特征，本文归纳出了辅助函数的四种构造方法。
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