名词
中文翻译：距离
同义词：
['gap', 'interval', 'gap between', 'distance between']
例句：
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1. Thetwo cities are separated by a distance of 50 kilometers.
这两个城市相隔50公里。
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2.The train will travel at a constant speed for the entire distance.
火车将在整个距离上以恒定速度行驶。
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3.The distance between the two countries is relatively small.
两国之间的距离相对较小。