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

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f(x)isboundedfromaboveandbelow,如何翻译?f(x)isboundedfromaboveandbelow,如何翻译?f(x)isboundedfromaboveandbel

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!