名词
中文翻译：洞扩张
同义词：
['expansion', 'expansion', 'enlargement', 'dilation']
例句：
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1. The hole in the wall expanded as the rainwater seeped in.
随着雨水渗入，墙上的洞扩大了。
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2. The scientist conducted an experiment to observe the expansion of a balloon filled with helium.
科学家进行了一个实验，观察充满氦气的气球膨胀情况。
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3. The expansion of the economy has led to increased demand for goods and services.
经济的扩张导致了对商品和服务需求的增加。