名词
中文翻译：四范围
同义词：
['fourfold range', 'fourfold zone', 'fourfold division']
例句：
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1. Thefour-range model is a useful tool for analyzing the market trends.
四区模型是分析市场趋势的一个有用的工具。
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2.The four-range system has been widely used in various industries.
四区系统在各个行业都有广泛的应用。
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3. The four-range method can effectively reduce the risk of investment.
四区法可以有效地降低投资风险。