f(x) is bounded from above and below ,如何翻译?

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f(x) is bounded from above and below ,如何翻译?

f(x) is bounded from above and below ,如何翻译?
f(x) is bounded from above and below ,如何翻译?

f(x) is bounded from above and below ,如何翻译?
f(x)有上下界

f(x)有上下限

f(x)有上限和下限

f(x)有上下界!