名词
中文翻译：上界
同义词：
['upper limit', 'upper boundary例句：1. The upper asymptote of the curve is its highest point.（曲线的上界是其最高点。）']
例句：
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1. The upper asymptote of the curve is its highest point.
曲线的上界是其最高点。
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2.The upper asymptote of the function f(x) = x^3 - 4x^2 + 3x - 1 is 5.
函数f(x) = x^3 - 4x^2 + 3x - 1的上界是5。
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3. The upper asymptote of the function f(x) = x^2 + 2x + 1 is 6.
函数f(x) = x^2 + 2x + 1的上界是6。