名词
中文翻译：外部
同义词：
['outside', 'external', 'outer']
例句：
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1. The city is surrounded by mountains and rivers.
这个城市被山和河包围着。
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2. The research team was studying the effects of pollution on the environment.
研究小组正在研究污染对环境的影响。
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3. The company's products are designed to cater to the needs of its customers.
该公司的产品旨在满足其客户的需求。