名词
中文翻译：旅行的长度
同义词：
['distance', 'span', 'duration', "course例句：1. The length of the journey is three days' travel time.（这段旅程需要三天的时间。）2. The length of the trip was unexpectedly short.（这次旅行出乎意料地短。）"]
例句：
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1. The length of the journey is three days' travel time.
这段旅程需要三天的时间。
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2. The length of the trip was unexpectedly short.
这次旅行出乎意料地短。
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3.The length of their stay in the city was only a few hours.
他们在城里逗留的时间只有几个小时。