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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。
youdao
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It is bounded above by a road that overhang it and below by a path.
该地以一条公路为界，公路悬于该地之上，通过一条小路下来。
youdao
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It is bounded above by a road that overhang it and below by a path.
该地以一条公路为界，公路悬于该地之上，通过一条小路下来。
youdao