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Here, the nonlinear term is bounded below and need not be nonnegative.
这里，非线性项是下有界的并且不需要是非负的。
An existence theorem of positive solution is established for a superlinear second-order three-point boundary value problem. Here, the nonlinear term is bounded below and need not be nonnegative.
建立了超线性二阶三个边值问题的一个正解存在定理。这里，非线性项是下有界的并且不需要是非负的。
These steps are bounded—the value won't go above the upper limit set by the program or below the lower limit.
每一步都是有界的，数值不会超过程序设置的最上限，也不会低于程序设定的最下限。
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