名词
中文翻译：渐近线
同义词：
['limit', 'vertex', 'endpoint']
例句：
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1. The line is asymptotic to the x-axis as y approaches infinity.
随着y趋近于无穷大，这条线与x轴平行。
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2. The function reaches its asymptote at point (3, 4).
该函数在点(3, 4)处达到其极限。
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3. The graph of the function has an asymptote at point (0, 0).
该函数的图形在点(0, 0)处有极限。