名词
中文翻译：变窄的开口
同义词：
['narrow opening', 'narrowed opening']
例句：
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1.The door is taper-shaped, which makes it difficult to open.
门是锥形的，很难打开。
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2.The tunnel is tapered at both ends, making it narrower as you go in.
隧道两端都是锥形的，随着你深入，它变得越来越窄。
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3. The window was taper-shaped, and the glass was thinner at the top than at the bottom.
窗户是锥形的，玻璃顶部比底部薄。